



Produced by Steffen Haugk




[Illustration: CAPTAIN THOMAS SAVERY, The inventor of the steam engine - see frontispiece.gif]


THE
MINER'S FRIEND;
OR,
~An Engine~
TO
RAISE WATER BY FIRE,
DESCRIBED.
AND OF THE MANNER OF FIXING IT IN MINES;
WITH AN ACCOUNT OF THE SEVERAL OTHER USES IT
IS APPLICABLE UNTO; AND AN
ANSWER TO THE OBJECTIONS MADE AGAINST IT.
BY
THOMAS SAVERY, Gent.

Pigri est ingenii contentum esse his, quae ab aliis inventa sunt.
                                                    SENECA.

LONDON: PRINETD FOR S. CROUCH, AT THE CORNER
OF POPE'S HEAD-ALLEY IN CORNHILL. 1702.

Reprinted, 1827.




LONDON:
Printed by W. Clowes.
Stanford-street




TO THE KING.


SIR,
Your Majesty having been graciously pleased to permit an experiment
before you at Hampton-court, of a small model of my engine described
in the following treatise, and at that time to show a seeming
satisfaction of the power and use of it; and having most graciously
enabled me, by your royal assent to a patent and act of parliament, to
pursue and perfect the same. By which your royal encouragement, it
being now fully completed, and put in practice in your dominions with
that repeated success and applause, that it is not to be doubted but
it will be of universal benefit and use to all your Majesty's
subjects. Of whom, your Majesty being the universal patron and father,
all arts and inventions that may promote their good and advantage,
seem to lay a just and natural claim to your Majesty's sacred
protection.

It is upon this consideration I am encouraged, with a profound
respect, to throw this performance of mine, with the author, at your
Majesty's royal feet, most humbly beseeching your Majesty, that, as it
had birth in your Majesty's auspicious reign, you will vouchsafe to
perpetuate it to future ages by the sanction of your royal
approbation, which is the utmost ambition of,

    May it please your Majesty,
        Your Majesty's
      most humble, most loyal,
        and most obedient Subject,

                          THOMAS SAVERY.




TO THE ROYAL SOCIETY.


At the request of some of your members, at the weekly meeting, at
Gresham-college, June the 14th, 1699, I had the honour to work a small
model of my engine before you, and you were pleased to approve of it.
Since which I have met with great difficulties and expense, to
instruct handicraft artificers to form my engine according to my
design; but my workmen, after so much experience, are become such
masters of the thing, that they oblige themselves to deliver what
engines they make me exactly tight and fit for service, and as such I
dare warrant them to any body that has occasion for them.

Your kindness in countenancing this invention in its first appearance
in the world, gives me hopes the usefulness of it will make it more
acceptable to your honourable Society, as they are the most proper
judges of what advantage it may be to mankind. And it would be
ungrateful in me not to make use of this opportunity to return you my
most humble and hearty thanks for the honour and favour you did me in
approving my design, and publishing it to the world,[1] which shall be
always acknowledged by

      Your most obliged
            and most humble Servant,
                          THOMAS SAVERY.


[1] Philosoph. Transact. Numb. 252.




TO THE
GENTLEMEN ADVENTURERS
IN THE
MINES OF ENGLAND.


I am very sensible a great many among you do as yet look on my
invention of raising water by the impellent force of fire, a useless
sort of a project, that never can answer my designs or pretensions;
and that it is altogether impossible that such an engine as this can
be wrought under ground, and succeed in the raising of water, and
draining your mines, so as to deserve any encouragement from you. I am
not very fond of lying under the scandal of a bare projector; and,
therefore, present you here with a draught of my machine, and lay
before you the uses of it, and leave it to your consideration whether
it be worth your while to make use of it or no. I can easily give
grains of allowance for your suspicions, because I know very well what
miscarriages there have been by people ignorant of what they pretend
to. These I know have been so frequent, so fair and promising at
first, but so short of performing what they pretended to, that your
prudence and discretion will not now suffer you to believe any thing
without a demonstration, your appetites to new inventions of this
nature having been balked too often; yet, after all, I must beg you
not to condemn me, before you have read what I have to say for myself;
and let not the failures of others prejudice me, or be placed to my
account. I have often lamented the want of understanding the true
powers of nature, which misfortune has, of late, put some on making
such vast engines and machines, both troublesome and expensive, yet of
no manner of use, inasmuch as the old engines, used many ages past,
far exceeded them; and I fear, whoever, by the old causes of motion,
pretends to improvements within this last century, does betray his
knowledge and judgment; for more than an hundred years since, men and
horses would raise by engines, then made, as much water as they have
ever since done, or I believe ever will, or according to the law of
nature ever can do; and though my thoughts have been long employed
about water-works, I should never have pretended to any invention of
that kind, had I not happily found out this new, but yet a much
stronger and cheaper force or cause of motion, than any before made
use of. But finding this of rarefaction by fire, the consideration of
the difficulties the miners and colliers labour under by the frequent
disorders, cumbersomeness, and in general of water-engines, encouraged
me to invent engines to work by this new force; that though I was
obliged to encounter the oddest and almost insuperable difficulties, I
spared neither time, pains, nor money, till I had absolutely conquered
them. I hope this will, at least, encourage you to read over this
small treatise I now put into your hands, for the further and more
particular information of the nature and uses of this engine for
raising water by the force of fire; after which, I shall patiently
submit to any judgment you shall please to pass upon me or the
invention, and may have reason to believe you will not any longer
suffer your judgments to be imposed on by those, whose profit and
interest it may seem to be to condemn both right and wrong; I mean
such who make your common gins, and their friends and acquaintance
among you; though I am very sure the promotion of the use of this
engine is their true interest, as I very plainly prove thus:--

The cheaper water is drawn, the more is the miner encouraged to
adventure; the more the miner adventures, the more pits or shafts must
be sunk; the more shafts or pits are sunk, the more wood-work will be
necessarily employed in timbering them, or supporting the sides from
falling in where the earth is loose; besides windlasses and all other
utensils of wood used in mines, or the trades depending thereon must
be more, which, by increasing the carpenters' trade in general, will
make them sufficient amends for the loss of a small part of that
branch of their trade, called gin-making. As for pump-making, that
part of the trade will be much improved by my engine; for I must use
board and timber for pipes, and have considerable employment for
pump-makers and carpenters for timber used about my engine; but shall
never employ any other person in making pipes, or any other
carpenter's work I shall have to do, but the person who was before
employed in the work, or such as shall be recommended, as a person
employed in the mines of the country wheresoever I shall fix engines,
provided they will work as cheap, and fairly, and observe the orders
and directions given them; for my design is not, in the least, to
prejudice the artificers, or, indeed, any other sort of people by this
invention; but, on the contrary, is intended for the benefit and
advantage of mankind in general, especially the people of my own
nation; and wherein, you gentlemen concerned in mines, may, if you
please, reap the greatest profit.

And although I do not question but the plan and draught of my engine
will be very well and readily understood with many gentlemen, by the
description here given; yet it will require a longer time in others to
employ their minds and thoughts more intensely about it, especially
such as have not been familiar and acquainted with things of this
kind; but should the engine, to the apprehension of some, seem
intricate and difficult to be worked, after all the description I have
given of it in this book, yet I can, and do assure them, that the
attending and working the engine is so far from being so, that it is
familiar and easy to be learned by those of the meanest capacity, in a
very little time; insomuch, that I have boys of thirteen or fourteen
years of age, who now attend and work it to perfection, and were
taught to do it in a few days; and I have known some learn to work the
engine in half an hour. We have a proverb, that interest never lies;
and I am assured that you gentlemen of the mines and collieries, when
you have once made this engine familiar in your works, and to
yourselves and servants; not only the profit, but abundance of other
advantages and conveniences which you will find to attend your works
in the use thereof, will create in you a favourable opinion of the
labours of

    Your real Friend and humble Servant,
                                THOMAS SAVERY.

  _London,
Sept. 22,_ 1701.




A DESCRIPTION
OF THE
DRAUGHT OF THE ENGINE,
FOR RAISING WATER BY FIRE.


  _a_, _a_, The furnaces.
  _b_, B, the two fire-places.
  _c_, the funnel or chimney.
  _d_, the small boiler.
  _e_, the pipe and cock of it.
  _f_, the screw that covers and confines its force.
  _g_, a small cock, a pipe going within eight inches of its bottom.
  _h_, A larger pipe going the same depth.
  _i_, a clack on the top of the said pipe.
  _k_, a pipe going from the box of the said clack or valve, into the
great boiler, about an inch into it.
  _l_, the great boiler.
  _m_, the screw with the regulator.
  _n_, a small cock and pipe going half way down the great boiler.
  _o_, O, steam-pipes, one end of each screw to the regulator, and the
other ends to the receivers.
  _p_, P, the vessels called receivers.
  _q_, q, the screws which bring on the pipes and clacks in the front
of the engine.
  _r_, _r_, R, R, valves or clack of brass, with screws to open and
come at them upon occasion.
  _s_, the force-pipe.
  _t_, the sucking-pipe.
  _v_, a square frame of wood, with holes round its bottom in the
water.
  _x_, a cistern with a buoy-cock coming from the force-pipe.
  _y_, a cock and pipe coming from the bottom of the said cistern.
  _z_, the handle of the regulator.





CHAPTER FIRST.
MANNER OF WORKING THE ENGINE.

* * * * *

THE
MANNER OF WORKING THE ENGINE.


The first thing is to fix the engine in a good double furnace, so
contrived that the flame of your fire may circulate round and
encompass your two boilers to the best advantage, as you do coppers
for brewing. Before you make any fire, unscrew _g_ and _n_, being the
two small gauge-pipes and cocks belonging to the two boilers, and at
the holes, fill _l_, the great boiler, two-thirds full of water, and
_d_, the small boiler, quite full; then screw in the said pipes again
as fast and light as possible; then light the fire at _b_. When the
water in _l_ boils, the handle of the regulator, marked _z_, must be
thrust from you as far as it will go, which makes all the steam rising
from the water in _l_ pass with irresistible force through _o_ into
_p_, pushing out all the air before it, through the clack, _r_, making
a noise as it goes; and when all is gone out, the bottom of the
vessel, _p_, will be very hot; then pull the handle of the regulator
to you, by which means you stop _o_, and force your steam through _o_
into the _p_, until that vessel has discharged its air through the
clack, _r_, up the force-pipe. In the mean time, by the steam's
condensing in the vessel _p_, a vacuum or emptiness is created, so
that the water must, and will, necessarily, raise up, through _t_, the
sucking-pipe, lifting up the clack, _r_, and filling the vessel, _p_.

In the mean time, the vessel, _p_, being emptied of its air, turn the
handle of the regulator from you again, and the force is upon the
surface of the water in _p_, which surface being only heated by the
steam, it does not condense it, but the steam gravitates or presses
with an elastic quality like air; still increasing its elasticity or
spring, till it counterpoises, or rather exceeds the weight of the
water ascending in _s_, the forcing-pipe, out of which, the water in
_p_ will be immediately discharged when once gotten to the top, which
takes up some time to recover that power; which having once got, and
being in work, it is easy for any one that never saw the engine, after
half an hour's experience, to keep a constant stream running out the
full bore of the pipe, _s_; for, on the outside of the vessel, _p_,
you may see how the water goes out, as well as if the vessel were
transparent; for, as far as the steam continues within the vessel, so
far is the vessel dry without, and so very hot, as scarce to endure
the least touch of the hand; but as far as the water is, the said
vessel will be cold and wet, where any water has fallen on it; which
cold and moisture vanishes as fast as the steam, in its descent, takes
place of the water; but if you force all the water out, the steam, or
a small part thereof, going through _r_, will rattle the clack, so as
to give sufficient notice to pall the handle of the regulator to you,
which, at the same time, begins to force out the water from _p_,
without the least alteration of the stream; only, sometimes, the
stream of water will be somewhat stronger than before, if you pull the
handle of the regulator before any considerable quantity of steam be
gone up the clack, _r_; but it is much better to let none of the steam
go off, for that is but losing so much strength, and is easily
prevented, by polling the regulator some little time before the vessel
forcing is quite emptied. This being done, immediately turn the cock
or pipe of the cistern, _x_, on _p_, so that the water proceeding from
_x_, through _y_, which is never open but when turned on _p_, or _P_;
but when between them, is tight and stanch; I say, the water, falling
on _p_, causes, by its coolness, the steam, which had such great force
just before to its elastic power, to condense, and become a vacuum or
empty apace, so that the vessel, _p_, is, by the external pressure of
the atmosphere, or what is vulgarly called suction, immediately
refilled, while _p_ is emptying; which being done, you push the handle
of the regulator from you, and throw the force on _p_, pulling the
condensing pipe over _p_, causing the steam in that vessel to
condense, so that it fills, while the other empties. The labour of
turning these two parts of the engine, viz. the regulator and
water-cock, and attending the fire, being no more than what a boy's
strength can perform for a day together, and is as easily learned as
their driving of a horse in a tub-gin; yet, after all, I would have
men, and those, too, the most apprehensive, employed in working of the
engine, supposing them more careful than boys. The difference of this
charge is not to be mentioned or accounted of, when we consider the
vast profit which those who use the engine will reap by it.

The ingenious reader will, probably, here object, that the steam being
the cause of this motion and force, and that steam is but water
rarefied, the boiler, _l_, must in some certain time be emptied, so as
the work of the engine must stop to replenish the boiler, or endanger
the burning out or melting the bottom of the boiler.

To answer which, please to observe the use of the small boiler, _d_,
when it is thought fit by the person tending the engine to replenish
the great boiler, which requires an hour and a half, or two hours'
time to the sinking one foot of water; then, I say, by turning the
cock of the small boiler, _e_, you cut off all communication between
_s_, the great force-pipe, and _d_, the small boiler, by which means
_d_ grows immediately hot, by throwing a little fire into _b_, and the
water of which boils, and in a very little time it gains more strength
than the great boiler; for the force of the great boiler being
perpetually spending and going out, and the other winding up, or
increasing, it is not long before the force in _d_ exceeds that in
_l_, so that the water in _d_ being depressed in _d_ by its own steam
or vapour, must necessarily rise through the pipe, _h_, opening the
clack, _i_, and so go through the pipe, _k_, into _l_, running till
the surface of the water in _d_ is equal to the bottom of the pit,
_h_; then steam and water going together, will, by a noise in the
clack, _i_, give sufficient assurance that _d_ has discharged and
emptied itself into _l_, to within eight inches of the bottom; and
inasmuch as, from the top of _d_ to the bottom of its pipe, _h_, is
contained about as much water as will replenish _l_, one foot, so you
may be certain _l_ is replenished one foot of course; then you open
the cock, _i_, and refill _d_ immediately; so that here is a constant
motion without fear or danger of disorder, or decay, if you would, at
any time, know if the great boiler, _l_, be more than half exhausted,
turn the small cock, _n_, whose pipe will deliver water, if the water
be above the level of its bottom, which is half way down the boiler;
if not, it will deliver steam. So, likewise, will _g_ show you if you
have more or less than eight inches of water in _d_, by which means
nothing but a stupid and wilful neglect, or mischievous design,
carried on for some hours, can any ways hurt the engine; and if a
master is suspicious of the design of a servant to do mischief, it is
easily discovered by those gauge-pipes; for if he come when the engine
is at work, and find the surface, _c_, of the water in _l_, below the
bottom of the gauge-pipe, _n_, or the water in _d_ below the bottom of
_g_, such a servant deserves correction, though three hours after
that, the working on would not damage or exhaust the boilers; as that,
in a word, the clacks being in all water-works always found the better
the longer they are used, and all the moving parts of our engine being
of like nature, the furnace being made of Stourbridge, or Windsor
brick, or fire-stone, I do not see it possible for the engine to decay
in many years; for the clacks, boxes, and mitre-pipe, regulator, and
cocks, are all of brass; and the vessels made of the best hammered
copper, of sufficient thickness to sustain the force of the working
the engine. In short, the engine is so naturally adapted to perform
what is required, that even those of the most ordinary and meanest
capacity may work it for some years without any injury, if not hired
or employed by some base person on purpose to destroy it; for after
the engine is once fixed, and at work, I may modestly affirm that the
adventurer, or supervisor of the mine, will be freed from that
perpetual charge, expense, and trouble of repairs, which all other
engines ever yet employed in mines for the raising of water, are
continually liable unto.




CHAPTER SECOND.
OF THE USES THAT THIS ENGINE MAY BE APPLIED UNTO.

* * * * *

OF THE USES THAT THIS ENGINE
MAY BE APPLIED UNTO.


It may be supposed that there are few people among us so ignorant, but
must necessarily know of what value the falls of water are in most
places, as being applicable to mills, which are made after various
kinds and forms, according to the different genius and abilities of
the millwright, for mill-work being in a manner infinitely
diversified; and had I leisure to comment thereon, and give you an
account, not only of the vast variety that I have seen and heard of,
but (when encouraged) what may yet be brought to work by a steady
stream, and the rotation or circular motion of a water-wheel, it would
swell these papers to a much larger volume than was at first designed,
and frustrate my intended brevity. I only just hint this to show what
use this engine may be put to in working of mills, especially where
coals are cheap.

I have only this to urge, that water, in its fall from any determinate
height, has simply a force answerable and equal to the force that
raises it. So that an engine which will raise as much water as two
horses working together at one time in such a work can do, and for
which there must be constantly kept ten or twelve horses for doing the
same, then, I say, such an engine will do the work or labour of ten or
twelve horses; and whereas this engine may be made large enough to do
the work required in employing eight, ten, fifteen, or twenty horses
to be constantly maintained and kept for doing such a work, it will be
improper to stint or confine its uses and operation in respect of
water-mills.

2. It may be of great use for palaces, for the nobility's or
gentlemen's houses; for, by a cistern on the top of a house, yoy may,
with a great deal of ease and little charge, throw what quantity of
water you have occasion for to the top of any house; which water, in
its fall, makes you what sorts of fountains you please, and supplies
any room in the house, and it is of excellent use in case of fire, of
which more hereafter.

3. Nothing can be more fit for serving cities and towns with water,
except a crank-work by the force of a river. In the composing such
sort of engines, I think no person hath excelled the ingenious Mr.
George Sorocold; but where they are forced to use horses, or any other
strength, I believe no ingenious person will deny this engine to have
the preference in all respects, being of more universal use than any
yet discovered or invented.

4. As for draining fens, marshes, &c. I suppose I need say no more
than this, that that force which will raise great quantities of water
a height of above eighty feet, must necessarily deliver a much greater
quantity at a lesser height; and that it is much cheaper, and every
way easier, especially where coals are water-borne, to continue the
discharge of any quantities of water by our engine, than it can be
done by any horse-engines whatsoever.

5. I believe it may be made very useful to ships, but I dare not
meddle with that matter, and leave it to the judgment of those who are
the best judges of maritime affairs.

6. For draining of mines and coal-pits the use of the engine will
sufficiently recommend itself in raising water so easy and cheap; and
I do not doubt, but that, in a few years, it will be a means of making
our mining trade, which is no small part of the wealth of this
kingdom, double, if not treble to what it now is. And if such vast
quantities of lead, tin, and coals, are now yearly exported, under the
difficulties of such an immense charge and pains as the miners, &c.
are now at to discharge their water, how much more may be hereafter
exported, when the charge will be very much lessened by the use of
this engine every way fitted for the use of mines? For the far greater
part of our richest mines and coal-pits are liable to two grand
inconveniences, and thereby rendered useless, viz. the irruption and
excess of subterraneous waters, as not being worth the expense of
draining them by the great charge of horses, or hand labour. Or,
secondly, fatal damps, by which many are struck blind, lame, or dead,
in these subterraneous cavities, if the mine is wanting of a due
circulation of air. Now, both these inconveniencies are naturally
remedied by the work of this engine, of raising water by the impellant
force of fire.

For the water, be the mine ever so deep, each engine working it sixty,
seventy, or eighty feet high, by applying or setting the engines one
over another, as shall be showed at large hereafter in the following
pages, you may, by a sufficient number of engines, keep the bottom of
any mine dry; and when once you know how large your feeder or spring
is, it is very easy to know what sized engine, or what number of
engines will do your business.

The coals used in this engine is of as little value as the coals
commonly burned on the mouths of the coal-pits are; for an engine of a
three-inch bore, or thereabout, working the water up sixty feet high,
requires a fire-place of not above twenty inches deep, and about
fourteen or fifteen inches wide, which will occasion so small a
consumption, that in a coal-pit it is of no account, as we have
experienced. And in all parts of England, where there are mines, coals
are so cheap, that the charge of them is not to be mentioned, when we
consider the vast quantity of water raised by the inconsiderable value
of the coals used and burnt in so small a furnace. What the quantity
of coals used for one engine in a year is cannot easily be
ascertained, because of the different nature of the several sorts of
coals.

As for the cure of damps by this engine, the air perpetually crowding
into the ash-hole and fire-place, as it is natural for it to do, and
with a most impetuous force discharged with the smoke at the top of
the chimney, the contiguous air is successively following it; so that
not only all steams or vapours whatsoever, that may or can arise, must
naturally force its way through the fire, and so be discharged at the
top with the smoke, but this motion of the fire will occasion the
fresh air to descend from above down all the pits, and every where
else in the mine, but down the chimney; provided you have a heading
drift, or passage from all the shafts or pits in the work, to that
place where the engine stands; whether the mouth of the said pit and
chimney be lower or higher than the mouths of any of the rest of the
pits or shafts in the same work it matters not, for here will be a
perpetual circulation of the air, and with that swiftness as is hardly
to be believed. This I have tried and know to be true, so leave the
ingenious miner to his own judgment, whether, when all the air is in a
swift motion, that any stagnation of air (which has always been
adjudged the cause of damps) can happen in any pit.




CHAPTER THIRD.
THE MANNER OF FIXING THE ENGINE FOR WATER-MILLS, PALACES, AND
GENTLEMEN'S SEATS, AND DRAINING FENS, AND SUPPLYING HOUSES WITH WATER
IN GENERAL.

* * * * *

THE
MANNER OF FIXING THE ENGINE
FOR WATER-MILLS, PALACES, AND GENTLEMEN'S SEATS, AND DRAINING FENS,
AND SUPPLYING HOUSES WITH WATER IN GENERAL.


1. For mills. The engine must be made and proportioned according to
the quantity of water required to drive the mill you would make use
of. Now suppose you would make a mill on a plain place, where you will
have only a pond, and a small spring of water no bigger than a quill;
then you must build your mill-house thirty-six feet high, in which you
may make what motions, and what sort of mills you please. By the side
of which house without, may be placed your water-wheel of thirty-two,
thirty-three, or thirty-four feet diameter. For the height of either
house or wheel I would confine no person too exactly, but I guess that
a convenient height, and no more than what is common enough. Under the
wheel I would have a pond, and on the top of the house a cistern of
wood lined with lead. The engine may be fixed in any corner of the
mill-house, twenty, twenty-one, twenty-two feet, or more, from the
level of the pond: there two boilers must be fixed, as shown you in
the draught for fixing the engine; and round each of them it is
convenient to have a hoop of iron, with straps coming from them to
rest on the brick-work, to support and strengthen them. Your clacks
and pipes in the front being supported by wood, and the vessels
standing on pedestals of wood, it is convenient that the flue, or
chimney, be so contrived as to draw very sharp, and the flue to
circulate round both the boilers, so that you may lose no part of your
strength.

2. For palaces, or the nobility's or gentlemen's houses, you may fix
the engine in any remote or out-room, whose floor is not above twenty
feet from the level of your water, and you may continue your
force-pipe to the top of your house, with a convenient cistern to hold
your water; into which lay the pipes which may convey the water as you
want it, either for pleasure or common occasions. This way of cisterns
on the top of your houses or palaces would be of singular use in case
of fire, as is said before; for in every staircase a pipe may go down
the corner, or behind the wainscot, so as to be no blemish even to the
finest of staircases. At every floor there may be a turn-cock with a
screw. At the utmost end have likewise a small leather pipe, kept well
oiled in a cupboard, or cavity in your wall, which may not be seen,
but on the opening some part of the wainscot, or such other
contrivance as the ingenious builder shall think fit to make use of.
This pipe of leather must be long enough to reach from the
landing-place, or stair-head, in all rooms depending thereon. One end
of this pipe has a screw to fit the cock in the other pipe, and at the
other end a pipe like the nose of a pair of bellows; so that wherever,
though under a bed, or the remotest part of any room in the house, the
fire breaks out, or is discovered, any servant having screwed the pipe
to the cock, stops the nozle with his thumb till he comes to the place
where the fire is, when, taking away his thumb, he, by directing the
nozle to the fire, immediately extinguishes it, which being liable to
be instantly used, I think a house, palace, &c. that has this
invention, may be said to be morally out of danger of being destroyed,
or so far injured as Whitehall and Kensington have been within a few
years. This command of water must be allowed to be of vast advantage
to any house whatsoever. Where brewing, washing, &c. is used, the
copper standing high may be filled as easy as if it stood low, by
which means the hot liquor may be contrived to go to all your coolers,
and other vessels, either by a syphon, stop-cock, &c. without the
hand-labour of pumping or bailing with buckets. But more conveniencies
than we can at present foresee will be discovered in the use of this
engine for palaces, houses, &c.

3. For fens, and the like, it is convenient that these engines be made
very large; for at all small heights a small quantity of fire will
deliver prodigious quantities of water. For suppose we force but
thirty feet, and suck twenty feet, if the boiler does but fill the
vessels, called receivers, with steam strong enough to counterpoise or
exceed the force of the atmosphere, or spring of the common air, it
will discharge them at so small a height as thirty feet force in a
very little time; and the steam having very little force or spring is
immediately condensed, so that it will presently suck full in one of
the vessels while the other is discharged. Now, inasmuch as the fire
being more or less adds nothing to the suction. I think such lifts,
being seldom above thirty-six feet, or under six feet, all the
directions further needful for fixing the engine for this use is, in
all lifts under twenty-four feet, to place your engine so as a little
above your force-clacks may be the place of the delivery of your water
into a convenient trough or lander, to be carried off at the most
proper place for its discharge. If it be any height above twenty-four
feet, you have nothing to do but to continue the length of your
force-pipe to the height required. It ought to have a shed or covering
round it, and to be placed at the lowest place of your fen or bog, as
other engines designed for that purpose commonly are.

As for fixing the engine in ships, when they may be thought probably
useful, I question not but we may find conveniency enough for fixing
them.

In mines and coal-pits the manner of fixing the engines is this; your
pit being sunk, and a sump, or proper well, or bottom cistern, made to
receive the water coming from the several feeders or springs.
Supposing an engine, carrying three and a quarter inch bore, is to be
fixed to deliver water about seventy feet high, constant running a
full bore; in such case you make a small room in your shaft or pit,
which, together with your shaft or pit, is nine feet square every way.
As for example, suppose your shaft six feet by four, take three feet
out of one side, and five out of another perpendicular nine feet,
making a small floor or platform of boards over that part of the shaft
which goes down to your sump or bottom cistern, so you have a complete
room big enough for your engine, where ten or twelve people may stand
on occasion. This floor may be about eighteen, nineteen, or twenty
feet from the water, at the lowest you ever will draw the water into
the sump or bottom cistern. If your ground be loose, it is convenient
to line this room with brick; if rock, it may support itself. But in
this the miner's judgment must direct him. That the engine will stand
best in the side of the pit where most is dug away, you may see in the
second figure of the engine, being fixed in a mine. Your pipes, &c.
must be fixed with cramps of iron, wood, or such materials as are
convenient, to the side of the pit or shaft, so as to make it stand as
firm as the very shaft itself. Your furnace must be so contrived, that
your flame take a turn or two round each of the boilers, which any
brick-layer used to furnaces can do; it being performed by running a
row of bricks round them both like a screw or worm, which being
contiguous to the wall of the furnaces and the boilers, makes it, as
it were, a worm-funnel round them both; from whence you may continue
your chimney to the top of your work, which you fasten to the sides of
your shafts in the corners as you please, either with iron or wood, or
both, according to the nature of the ground. And wherever you make a
sudden bend or nook near a right angle in the chimney, have a loose
brick or stone to take out the soot, if any should settle in such
place, which in long working it may do.




SEVERAL OBJECTIONS
AGAINST THE
WORKING THIS ENGINE ANSWERED,
IN
A DIALOGUE
BETWEEN A MINER AND THE AUTHOR.




A DIALOGUE
BETWEEN A MINER AND THE AUTHOR.


_Miner_. Sir, having been some time concerned in the engines now used
for drawing water out of our mines, and hearing so much talk of this
wonderful invention of yours, of raising water by fire, I was very
desirous to enter into some discourse with you concerning the nature,
use, and application of your engine, so strangely differing from all
other engines ever yet invented for our works, and which, you
positively affirm, will every way tend so much to our advantage in the
use of them; and I do not doubt of meeting with that plainness,
freedom, and good humour, that your discourse is generally accompanied
with. And with the same freedom resolve me in such questions as the
general sense of us miners may naturally propose to object against the
use of your engine, especially such of us as are yet ignorant of its
use and operation, who are more capable to judge of fact, than of the
nature and power of that force which raises your water.

_Author_. Sir, I am extremely obliged to you for your freedom, and
shall readily embrace all opportunities to inform and explain to you
the true use and nature of my engine; and, therefore, desire you, with
all imaginable freedom, to proceed and ask what questions you please,
either as to your own thoughts, as well as what has been suggested to
you by others. And you may be assured of a plain and candid answer to
all your objections.

_Miner_. Then, sir, which way will you go to work with your engine to
clear an old work full of water?

_Author_. Why, sir, to deal plainly with you, if your shafts are, or
may be cut straight, your tub-engines, or chain pumps, may draw forth
the water. And the charge, in that respect, is not to be accounted
for, because no mine would be thrown up or neglected but on account of
the feeders or springs, which being certain, and constantly to be
carried off winter and summer, the prospect of being likely to
succeed, makes your mine worth working or emptying within twenty feet
of the bottom, if ever they were worth sinking, though you work or
drain by the common way of tubs or chain-pumps. And could the constant
charge of those engines be afforded, numbers of them will empty and
keep under any work; but it is the constant charge of carrying off
what the springs bring in is the chief thing to be considered in the
business of mines, which constant charge is what we lessen very much
by this engine of mine.

_Miner_. What signifies your engine then, sir, if it be not capable of
sinking or forking an old mine?

_Author_. Hold, my good friend, a little patience; I have dealt
plainly and impartially with you about the use of your old engines:
and for my engine, it will clear an old work, if full of water, as
readily as your tub-gins or chain-pumps, provided the shafts are good.
The method I propose to clear an old mine, if sixty feet deep, and
full of water, the feeders not above two-inch bore, which is done at a
very small charge after this manner; _viz_. I fix my engine on the top
of the mine, and only suck and deliver a three and a quarter inch
bore; as soon as we have sunk the water as far as our suction will go,
which will be some twenty-two, twenty-four, or twenty-six feet deep
below the surface, there I make a room fit to receive another engine,
which I fix with his force-pipe to go up to the top of the pit; and
when I have sunk about twenty-four or twenty-six feet more, then I fix
a smaller engine of two inches bore, which, sucking twenty, and
forcing forty, does your work and keeps all safe; or let your small
engine be kept at work, while you remove the larger engine from the
top to the middle station, and then you will have occasion for no more
than two engines, the greatest of which may be removed as soon as the
smaller is fixed in the lowest or proper station. And that you may be
convinced of my impartiality, it is my opinion, that in gaining an old
work, or sinking a new one, you use your old engines of tub or
chain-pumps: this engine of mine being most proper, when you are come
fairly to the bottom either of the ore or coal; for then, if you have
but one lift, one station or engine-room will be sufficient. And by
having two sumps or bottom cisterns, your water may, in some measure,
settle in one of them in its passage to the other. So that the miners
working tolerably clean, and suffering as little dead or loose coal or
ore as is possible to mix with the water, you may have the water to
draw only a little discoloured; for you know, as well as I, that
generally the water coming from mines or coal-pits, while they work by
the gins now in use, is almost clear water.

_Miner_. Sir, I thank you for your candour in relation to the clearing
of an old work. But supposing that our water arises thick and muddy,
which you know will sometimes happen, what shall we do with your
engine then?

_Author_. What you say, sir, I know to be very true, that sometimes
you have thick, muddy gravel and nasty water. To prevent which from
coming into, or offending our pipes, we have a frame of board made
full of holes round about the bottom of our pipe that receives the
water, for sluge or fine dirt it will do my engine no injury. Indeed,
the clearer our water is in our boilers the better it is for our work;
but for our receivers and their clacks you may clear them as you work
it from stones, coal, ore, or any other annoyance, though hung in the
very clack; for by emptying of one or both the receivers of their
water, you cause the motion, either of suction or force, immediately
to be so strong, as to clear and blow out all before it to the top of
the pit; insomuch, that I have found filings of copper, large bits of
metal, considerable quantities of coal and stone, delivered and thrown
up with water out of my engine above sixty feet high. However, clear
water is preferable before the dirty water in the work of mine engine.

_Miner_. But, dear sir, if sixty, seventy, or eighty feet be the
determinate height for raising of water by your engine, how shall we
use your engine in a mine or pit that requires water to be raised
three times eighty feet, as you know some of our works do.

_Author_. I heartily thank you, sir, for this last proposal, because I
have now an opportunity to acquaint you, that the force used in my
engine is in a manner infinite and unlimited, and will raise your
water five hundred or one thousand feet high, were any pit so deep;
and that you could find us a way to procure strength enough to support
such an immense weight, as a pillar of water a thousand feet high must
certainly produce. However, to give you an answer, I must entreat you
to give my engine as kind entertainment and fair quarter as you do to
your engines now in use: for, I am sure, you are not ignorant of a
custom used in very deep mines, (in several parts of England,) of
raising their water by several lifts, from cistern to cistern, to a
very great height, although some of their lifts may not be above
twelve, sixteen, or twenty feet a lift at the most. And suppose that
your engine now in use at twenty feet the lift, and my engine at
sixty, seventy, or eighty feet, for at any of these lifts we raise a
full bore of water with much ease, then one lift of my engine at sixty
feet answers to three lifts of your engines at twenty feet, and also
to four of your lifts at eighty feet, &c., which you may please to
take for a sufficient answer to your last objection. I have known, in
Cornwall, a work with three lifts, of about eighteen feet each lift,
and carrying a three and a quarter inch bore, that cost forty-two
shillings per diem, reckoning twenty-four hours the day, for labour,
besides wear and tear of engines; each pump having four men working
eight hours, at fourteenpence a man, and the men obliged to rest at
least one-third part of that time.

_Miner_. You have, sir, hitherto given me undeniable answers to my
former objections, for which I thank you; but I fancy I shall puzzle
you, when I ask you how you will manage your engine to draw up our
water, where the shafts are not direct, but turn and wind to and fro?

_Author_. Sir, this last question is so far from being any hardship
put upon my engine, that no engine ever yet invented was so naturally
adapted to work in these crooked shafts as mine is; for let the
windings or turnings of the shafts be what they will, the
perpendicular weight of water is all that my engine has to account
for, and is the same as if it made the figure of a distiller's worm,
and went through the straightest pipe imaginable, except a little
inconsiderable friction of the water against the side of the pipe that
is crooked, more than is in the straight pipe, which is so small a
matter, that a very nice judge would hardly be able to distinguish
whether the crooked or straight pipe carried off most water in the
working. For the flue that carries the smoke, experience sufficiently
instructs you, that you may turn and wind it any way you please, and
that such windings in their drawing most air do rather improve than
prejudice your flue, as any one experienced in building of furnaces
can inform you.

_Miner_. Well, sir, I find that our crooked shafts will not any way
incommode your engine: but what think you of accommodating your engine
to the service of the lead mines, whose shafts are many times so
narrow, that it will be very difficult to get your engine down?

_Author_. I perceive, sir, you are yet much a stranger to the nature
of my engine, which is so furnished with brass screws, and as strong
as the very metal itself, that you may take it to pieces, and with
ease put it together again fit to work in a few hours' time; and so
contrived, that where a man can well go down, there I can put down my
engine in several pieces and fix them below, for the greatest boiler
belonging to my engine is between twenty-four and thirty inches
diameter, and may, if occasion require, be made yet much narrower and
deeper. And that if it be difficult to bring the shaft of the mine to
fit my engine, I can, with much ease, make my engine to fit the shaft
of any mine.

_Miner_. But will not these brass valves that you speak of in your
engine, speedily wear out and stop your work?

_Author_. No: they cannot fail me; because experience shows us, that
brass valves improve, rather than grow worse, by twenty or thirty
years use in any force-work, where constantly worked, and where they
rise and fall twenty times oftener than my valves will do.

_Miner_. But what think you, sir, if you should meet with such
corrosive water in some of our mines, as will, in a little time, eat
through your copper vessels.

_Author_. Truly, sir, this question does a little startle me, because
I never expected to meet any water of such a corrosive quality in any
mine: and could I find out a mine, whose water abounds with such acid
particles, as to destroy or injure the copper vessels of my engine, I
would drain that mine for nothing but the water I shall take up;
because the water would be more valuable than any ore (I believe) in
England. And were there even a tenth part of aquafortis to nine-tenths
of common water, which is impossible to suppose it should be, I say,
such a water could have no effect on the coppers, were that water to
lodge some time in the copper vessels, much less in passing through
them with that celerity and rapid motion that always accompanies it.

_Miner_. But, sir, will not such a continual fire, as must be kept
under your boilers, burn them out in two or three months' time, and
spoil the work of your engine?

_Author_. I can assure you they will not decay in some years, unless
some fellow be hired or employed on purpose to do it. And should any
villain be employed to burn, break, or destroy any of the engines now
used in your works for raising of water, we are then on the same level
with you in that point. But I will give you one reason why my engines
will not easily decay, and I am sure that will go further with you
than all the affirmation I can make. For, first of all, although a
white heat will melt copper, and a red heat, and sudden cooling it
again, will scale the copper, yet such a heat as is possible for it to
have or suffer while water is in the boiler can have no ill effect, or
cause any alteration in our copper. A friend of mine has coppers used
in sugar boiling of twenty years' standing. They may be a small matter
worn with cleaning on the inside, whereas on the outside there does
not appear the least visible decay: for as soon as the fire has thrown
a thin coat of soot on the outside of the boiler, the flame has no
other effect on it than to cause the water in it to boil.

_Miner_. But we have often combustible vapours in our mines, which
taking fire from the candles used there, do, by a sudden explosion,
destroy both the mine and the miner; and therefore I am afraid that
the fire used in your engine will be very dangerous, and apt to kindle
those combustibles more than our candles.

_Author_. To answer this objection, I will desire leave to give you my
notion of those combustibles, which, in short, is this: that when your
miners come into a close place, where there is no circulation of air
to carry off the effluvia, or atoms constantly rising like fine dust
in a powder-mill, they by knocking and working do increase to be very
numerous, like to those loose particles in a powder-mill. But it is
the work of some time for those vapours to come to perfection; for I
have heard several experienced miners say, that it is common to avoid
the danger of those vapours, by retiring as soon as they see the flame
of their candles burn longer than ordinary, which may be, discerned
sometimes long before the air is thick enough of this combustible
matter to take fire at once, and, like gunpowder, to destroy all. I
did hear one say, that from an inch and a half, once the flame of his
candle did gradually increase to two feet long, and yet he escaped.
Which makes it very plain, that stagnation of air is the sole cause of
this inconvenience in mines, which may be totally prevented by a pipe
going from the ash-pit of our furnace to any part of the mine liable
to stagnation. For the air will press with great violence through the
pipe into the fire, before the combustible matter can be ready to do
any hurt, and passing through the fire, make way for fresh air to
descend in the room of it. So that our fire, instead of blowing up of
your works, is the best means that can be used to prevent so fatal an
accident; and will likewise carry off all unwholesome vapours, damps,
or steams, which may proceed from corruption of air, by stagnations or
vapours arising from any poisonous earth or mineral.

_Miner_. This notion of yours carries reason and demonstration along
with it, which pleases me wonderfully. But, sir, is not your price too
great for these engines of yours?

_Author_. By what I shall offer to you, as to my price, I am sure to
have you a friend to me and my engine for ever. For I must tell you,
that I would never have sent my engine into the world, if it would not
raise your water with more ease and conveniency to you and your
servants, and also much cheaper than any other engine ever used in
your works, without which I could never propose any advantage to
myself by it. And to convince you of the truth of my assertion, I dare
undertake the engine shall raise you as much water for eightpence, as
will cost you a shilling to raise the like with your old engines in
coal-pits. By this one article the miner will save one-third part of
his former charge, which is thirty-three pounds six shillings and
eightpence saved out of every hundred pounds. A brave estate gained in
one year out of such great works, where three, six, or it may be eight
thousand pounds per annum is expended for clearing their mines of
water only, besides the charge and repair of gins, engines, horses, &c.
I hope you will not now account my engines dear under such
conditions as I now offer; but if I should, with you, suppose my
engine proportionably dear, or as dear as the engines you now use for
drawing up your water, which is impossible, my engine will be
preferable before yours in many respects, insomuch, as mine prevents
your damps, and the evil effect of them: and as it will be my interest
to allow those that first set my engine at work considerable
advantages, so I hope I may assure myself of due encouragement from
the ingenious, who are ever studious to promote all inventions useful
and beneficial to the public; for they must conclude, that an engine
which for some time has daily employed the best artificers to work on
it, was not to be brought forth in one day: and to bring it to that
perfection you now find it, must have cost me and my friends not a
little money to make the workmen capable of their work with that
certainty and exactness they now do. And for working the engine any
person may have his servant taught it, it being to be learnt in a very
short time by one of an ordinary capacity.

_Miner_. But there are people who pretend to do great things in the
improvement of engines to work by hand or horses, the hope and
expectation of which has hindered some of us in our work and tired
others, so as to make them out of love with all engines, and almost
with the trade of mining. And though I wish the contrary, I fear this
may prove some hinderance to the promoting your interest.

_Author_. True, sir, I own that time out of mind there have been
mountebanks and impostors in all faculties who pretend to great
things, but do perform nothing effectually. And it would be hard if
that should be drawn into consequence, that because some are knaves,
therefore none are honest. I know the notions of the perpetual motion,
or self-moving engine, and many such like whims are pretended to by
designing men, and believed by ignorant ones: but the judicious man,
who considers the laws of motion, knows it is an infallible rule, that
whatsoever matter is to be removed upward, must have a force superior
to the weight to be lifted up, if its motion be required as swift as
the motion of the moving cause; if slower, proportionably less
strength will do; if swifter, then the moving cause, as men's hands,
horses, or dead weight, then must the strength of the moving cause be
increased proportionably, or no motion can be produced. And the
experience of ages shows us this to be a most sure rule, allowing for
friction, which is larger, the more wheels or parts an engine
consisteth of; and, of consequence, the fewer parts or wheels an
engine consisteth of the easier it works; so that by barely looking
on a pump, if it has more parts or wheels than the common crank-work,
you may conclude it worse; if a chain-work or tub-work the same. So
that all that can be expected is, to make those go easier than they
are now made to go by ingenious workmen expert in making them. And if
you try how small a matter will move those engines when not loaded
with water, you will find the friction so small as not worth any
mending, could it be done, especially the tub-gin, whose friction
increases the least in being loaded of any; but the others are vastly
increased by the leathers of their suckers being forced broader, and
rubbing with much greater force against the barrel they work in,
according to the height the pipes are raised.

And I hope, when it is considered how far this engine of mine differs
from the bare pretensions of ignorant or designing men, and that any
persons may see what my engine will perform before they contract for
it, there will be found no ground for the least suspicion in any
person concerned to employ them in mines; but, to the contrary, afford
us a generous encouragement in a business so conducive to the
increasing the mining trade, and thereby enrich themselves and the
nation, and increase the king's revenue.

I could heartily wish all miners, for their own as well as their
country's interest, were good mechanics, and truly understood the
nature, use, and application of all kinds of engines; for, I am sure,
those that do will be my best friends, without expecting that horses,
or men, or any other strength, can or will do more than what nature
and the laws of motion has allowed them.




[Illustration: Figure I   - see figure_1.gif]
[Illustration: Figure II  - see figure_2.gif]
[Illustration: Figure III - see figure_3.gif]
[Illustration: Figure IV  - see figure_4.gif]




Transcriber's note:






End of the Project Gutenberg EBook of The Miner's Friend, by Thomas Savery

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