IMPROVEMENTS IN VALVES AND APPARATUS FOR GOVERNING STEAM ENGINES, AND FOR INCREASING THE SAFETY OF STEAM BOLLERS
Year: 1856

page_text: LETTERS PATENT to Henry Hindle, of Cavendish Street, Ashton-under-
Lyne, in the County of Lancaster, for the Invention of "IMPROVEMENTS IN
VALVES AND APPARATUS FOR GOVERNING STEAM ENGINES, AND FOR INCREASING
THE SAFETY OF STEAM BOLLERS."
Sealed the 16th January 1857, and dated the 22nd July 1856..
PROVISIONAL SPECIFICATION left by the said Henry Hindle at the
Office of the Commissioners of Patents, with his Petition, on the
22nd July 1856.
I, HENRY HINDLE, of Cavendish Street, Ashton-under-Lyne, in the County
of Lancaster, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN VALVES AND APPARATUS FOR GOVERNING STEAM ENGINES, AND
FOR INCREASING THE SAFETY OF STEAM BOILERS," to be as follows:-
The nature of my Invention consists, first, in the construction of a throttle
valve for steam engines, which is parallel in the direction of its length, and
reduced on two opposite sides in the direction of its diameter, in which direc-
tion a steam passage is formed through the middle of the valve. This valve
is enclosed in a cylindrical case, which is also enclosed in an outer cylindrical
case; one end of the case is closed, and forms a cover to an open end of the
inner case, the other end of which is closed, and forms a cover to the open
end of the outer case. A steam passage is formed in the outer case in con-
nection with a steam passage of the inner case, and so connected as to form
one passage for the admission of steam to the inner case, which has two other
steam passages directly opposite to each other leading into steam ways formed
betwixt the inner and outer case; terminating in one steam passage through
the outer case, from which steam passes to the engine. One end of the valve

page_text: rests upon a spindle end in the bottom or closed end of the outer case, and
from the other end of the valve a spindle is brought outside through the closed
end of the inner case, and to the spindle a lever is attached and connected to
the governor, from which the valve receives a curvilinear or rotatory motion,
and is so made to cover or uncover the two opposite steam passages of the
inner case.
Secondly, in another construction of throttle valve, which is circular and
parallel, or cylindrical, and is enclosed in a cylindrical case, which is also
enclosed in an outer cylindrical case. One end of the inner case is closed,
and the other open for the admission of the steam. A parallel groove or steam
passage is formed round and near the entrance of the inner case, opening into
a steam way or steam ways formed betwixt the inner and outer cases, thro
which steam passes into the steam pipe connected with the engine. From
the rim of the valve two arms are centrally connected with a boss, which rests
upon a stud centrally attached to the closed end of the inner case, and from
the boss of the valve a spindle is brought outside, and connected with the
governor, from which the valve receives a reciprocating motion. When the
valve is moved from the closed end towards the open end of the inner case it
covers, and by a contrary motion uncovers the steam passage formed in the
inner case.
Thirdly, in the construction of a stop valve for steam engines, which consists
of a circular and parallel rim, with a slight flange outside and at one end of
the rim. Up to the flange the valve enters into a cylindrical recess or case,
which is surrounded by an outer cylindrical case. One end of the inner case
is closed and the other open, and round the sides and near to the bottom or
closed end of the case a steam passage is formed, which opens into a steam
way or steam ways formed betwixt the inner and outer cases, through which
steam passes to the engine. One end of the valve is faced to the bottom of the
inner case, and the flange at the other end is faced to the outer edge of the
case, so as to make the valve steam-tight when closed. From the valve rim
two arms are centrally connected with a boss, which rests upon a stud cen-
trally attached to the closed end of the inner case, and from a spindle attached
to the boss and brought outside motion is communicated to the valve; and
as the valve is moved into or out of the inner case, it covers or uncovers the
steam passage in the inner case, and so intercepts or allows the passage of
steam to the engine.
Fourthly, in the application of a clap expansion valve, and the construction
of apparatus to work in connection with the slide valve, the latter being so
formed as to enclose the supply passage of the cylinder, having itself steam

page_text: passages leading to the cylinder passages. To each of the passages of the
working valve a clap valve is applied, and so fitted as to be steam-tight when'
closed, and the claps are connected with opposite ends of a double lever or
beam, which rests upon a spindle attached to the middle of the working
valve. The claps are acted upon by steam passing to the cylinder, and are
caused to oscillate with the beain, so as to cover and uncover alternately the
steam passages of the working valve. Through one side of the valve chest,
and near to one end, a slight spindle passes thro' a bush and inside the steam'
chest; it has a flat end equal in width to the length of motion given to the
working valve, and equal in thickness to half the distance the claps are set to
open, and in length equal to twice the width. Across the bush, and parallel
with the cylinder plate, a slot is formed, into which the flat end of the spindle
is admitted to the extent of half its length, and the other half projecting into
the valve chest is tapered to a point in the direction of its length. To one
of the claps, in a line with the spindle, a stop is attached, which is similar in
form to the flat and taper end of the spindle round which the valve-stop passes'
when the engine is at work; and as the spindle is moved into or out of the
valve chest, the closing of the claps is varied, and supply of steam regulated,
and the spindle may be so moved by direct connection with an ordinary
governor.
Fifthly, in the manner of applying a slide expansion valve to work in con- '
nection with the slide working valve, the latter being so formed as to enclose
the supply steam passages of the cylinder, having itself steam passages leading
to the cylinder passages; on the valve so formed is a stationary plate with
steam passages corresponding to those of the valve, and on the stationary
plate is a moveable plate or valve, which covers one of the steam passages of
the stationary plate when the other is open. A reciprocating motion is com-
municated to the moveable plate from connection with differential or other'
gear, and it is so made to cover and uncover alternately the steam passages
of the stationary plate, and to admit and intercept supply of steam to the"
cylinder without affecting the escape of exhaust steam.
Sixthly, in the application of a valve for the recovering of exhaust steam to
prevent the formation of vacuum in the cylinders of non-condensing engines
working expansively, for which purpose two steam passages are formed from
the exhaust passage or passages of the working valve into the supply passages,
and in each of the supply passages a clap valve is so placed as to cover the
passages communicating with the exhaust, and so fitted as to be steam-tight
when closed. The claps are caused to open from the pressure of exhaust
steam, which, as it leaves one end of the cylinder, passes into the other,

page_text: when, from expansion of steam in the cylinder, pressure is diminished below
atmospheric pressure.
Seventhly, in the construction of an expansion governor, which consists of
a horizontal shaft with a fly wheel loose upon it, and a spring attached to the
fly wheel pressing upon a semi-excentric fast upon the shaft, whereby, as the
shaft revolves, the fly wheel is taken round, and if the velocity of the engine
exceed the velocity for which the spring is set, the fly wheel, by the resistance
of its inertia recedes; but if the velocity diminish, the fly wheel, by the force
of the spring and its momentum, advances. To the fly wheel a bevel wheel is
attached, and another bevel wheel is attached to a valve tappet loose upon the
shaft, and the two wheels are connected by an intermediate bevel wheel, by
means of which the variations of the fly wheel are reversely communicated to
the valvo tappet.
Eighthly, in the construction of a double discharge pressure valve for steam
boilers, which has a cylindrical case flat at each end, and through each end
a circular steam passage is formed to the inside of the caso; on the outside
of the case a flange is cast, thro' which a steam passage is formed to the
inside, and by means of the flange the case is attached to a short elbow pipe
inside the boiler, and placed in a vertical position. The valve consists of two
parts, circular and flat; one part covering the steam passage formed in the
upper end of the case, and the other part covering the steam passage formed
in the lower end of the case. The upper part is placed outside the case, and
the lower part inside, and both are connected by a spindle. The area of the
lower part is greater than that of the upper, and a weight is suspended from
the spindle, proportioned to the difference of area in the upper and lower
parts of the valve, and the degree of pressure required in the boiler. From
excess of pressure the valve opens, and through both ends of the valve case
allows escape of steam from the boiler.
Ninthly, in the application of a valve and apparatus for discharging excess
of water from steam boilers, for which purpose a valve and valve case, similar
in form to those of the double discharge pressure valve, are attached to a
straight pipe inside the boiler, the valve case being placed in a vertical
position, and the pipe attached to the boiler in a horizontal position. The
upper and lower parts of the valve are of equal area that the pressure of steam
or water upon the valve may be equal in opposite directions. Over the valve
is a lever, one end of which rests upon a fulcrum attached to the valve pipe,
and to the other end a float is attached, and the lever passing through a slot
formed in the valve spindle, rests upon the spindle betwixt the fulcrum and
the float.
At full water in the boiler the valve is barely covered with water,

page_text: and the float dips so far as to displace its own weight of water.
From a
further supply of water the float rises, opens the valve, and allows water to
escape from the boiler.
Tenthly, in the application of a valve and apparatus for diminishing the
production of steam in steam boilers when pressure is too high or water low,
for which purpose a valve, similar to the double discharge pressure valve, is
applied in a similar manner inside the boiler. On a fulcrum attached to the
valve case a lever is placed, one end of which is connected with the valve
spindle, and from the other end a float is suspended, which is immersed in
water, and set at a depth to which water may be reduced without injury to
the boiler. The float is so adjusted as not to affect the valve when covered
with water, but when bare of water to descend and cause the valve to open.
To the valve pipe, outside the boiler, an escape pipe is attached, and carried-to
the ash-pit, and when, from excess of steam or want of water, the valve is
caused to open, steam is conveyed to and discharged in the ash-pit, and from
passing into the furnace in place of air, the heat of the furnace is reduced, and
production of steam in the boiler diminished.
Eleventhly, in the application of a valve and apparatus for limiting the use
of water in steam boilers. For this purpose the second form of throttle valve
before described is applied inside the boiler, at the mouth of the pipe which
carries steam from the boiler to the engine. From the boss of the valve a
spindle is attached to a lever, one end of which rests upon a fulcrum attached
to the valve case or boiler top, and from the other end of the lever a float is
suspended and immersed in water, and set at a depth beyond which water
may not be used without injury to the boiler. The float is so adjusted as not
to sink when covered with water, but when bare of water to descend, and by
closing the valve to intercept supply of steam, and stop the engine.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Ilindle in the Great Seal Patent Office on the
22nd January 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, J, HENRY
HINDLE, of Cavendish Street, Ashton-under-Lyne, in the County of Lancaster,
send greeting.
WHEREAS IIer most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date: the Twenty-second day of July, in the year of our Lord
One thousand eight hundred and fifty-six, in the twentieth. year of Her reign,.

page_text: did, for Herself, Her heirs and successors, give and grant unto me, the said
Henry Hindle, Her special license that I, the said Henry Hindle, my execu-
tors, administrators, and assigns, or such others as I, the said Henry Hindle,
my executors, administrators, and assigns, should at any time agree with, and
no others, from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN VALVES AND APPARATUS FOR
GOVERNING STEAM ENGINES, AND FOR INCREASING THE SAFETY OF STEAM BOILERS,"
upon the condition (amongst others) that I, the said Henry Hindle, my
executors or administrators, by an instrument in writing under my, or their,
or one of their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Henry Hindle, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement, that is to say):-
The nature of my Invention, and the manner of performing the same, will
be fully understood and readily carried into effect on reference to the accom-
panying Drawings, and to the following descriptions thereof.
On Sheet 1, Figure 1 is a side view of my improved throttle valve; Figure 2
is a sectional elevation; Figure 3 is a plan view of the valve, taken in section
through the line A, B, in Figure 2; Figure 4 is the valve shewn in Figure 3; a
is the lid of the inner case, and cover to the outer case, which has a branch pipe
and flange on each side, marked 6 and c; the latter is the feed pipe from the
boiler, and the former a pipe leading to the engine; d is the valve spindle to
which the lever e is attached; f is a portion of the governor rod attached to
the lever e, whereby motion is communicated to the valve g, the lever < being
stopped by the pin i when the valve is wholly open or closed. In Figure 2,
the valve spindle is shewn with a shoulder ground steam-tight to the bush k,
through which the spindle d is brought outside and attached to the lever e.
1 is a portion of the valve spindle which enters the bush m in the closed end
of the outer case n; and o is the inner case, to which the lid a is attached or
cast. From the inner case o the steam passes through two opposite steam
ways, marked g and r, which, when covered by the valve, produces an equal
pressure of steam upon the valve. To the steam way the steam passes.

page_text: through the valve, but to the steam way q it is admitted without passing
through the valve; the steam course to q or.r being crossed by the valve g,
produces a tendency in the valve to close, which tendency to close increases
and assists the governor balls to ascend, when the speed of the engine quickens
and decreases, and permits the governor balls to descend when the speed of
the engine diminishes.
Figure 5 represents a section of another mode of constructing my improved
throttle valves. a is the valve rim; b, the boss, to which the valve rim is
connected by the feathers c, seen best in Figure 6; d is a stud, upon which the
valve rests; is the recess or inner case; and the outer case; g is the
steam way betwixt the inner and outer case, which is covered by the valve a;
h is the feed pipe from the boiler, and i a pipe leading to the engine; ; is a
spindle from the valve, brought outside through the stuffing box k, and
connected with the lever 1, to which the rod m from the governor is attached,
whereby a lateral motion is communicated to the valve. When the valve a is
moved into or out of the recess e, it covers or uncovers the steam way g, and so
allows or intercepts the supply of steam to the engine; the motion of the valve
being unaffected by the pressure of steam acting upon it, which is equal in
opposite directions.
Figure 7 is a section of my improved stop valve, and Figure 6 is another
section of the same. e is the inner case; f, the outer case; h, the feed
pipe from the boiler, and i a pipe to the engine; g is the steam way
betwixt the inner and outer cases, covered by the valve rim a, which is
made steam-tight by facing to the bottom or closed end of the inner case e,
the flange a being faced to the outer edge. The valve rim a is con-
nected with the boss 6 by means of the feathers c, and from the boss 6 the
spindle is brought outside through the stuffing box k, and supported by the
bearer m. A lateral motion is communicated to the valve by the hand wheel
n' and the screw at the end of the spindle j. When the valve is drawn out
or moved into the inner case e, it admits or intercepts the supply of steam to
the engine.
Figure 8 is a section of the clap expansion valve. a is the valve chest and.
cover; b, the cylinder plate; and c, the working valve, to which motion is
communicated by the spindle d, which is brought outside the valve chest.
through the stuffing box e, and connected with ordinary valve gear; f and g
are supply steam passages through tho valve c, which communicate with the
supply passages h and i of the cylinder; j is the exhaust passage in the valve c,
and k the exhaust passage of the cylinder; 1, 1, is a beam connecting the
clap valves m and n, which extend over the supply passages of the valve c, ;

page_text: and are set to open so far as to admit steam equal to the capacity of the
supply passages of the cylinder. The beam rests upon a spindle o, which
is supported by two bearers p, p, attached to the valve c, shewn in Figure 9,
which is a plan view of the valve. When the valve c is at work, the claps m
and n are carried with it; and as the valve passage f opens to the cylinder
passage h, the clap m, acted upon by the steam passing to the cylinder, has
ก tendency to close, but it is held from closing until the valve stop 9 has
passed over the tongue r; and the clap n being opened as the clap m closes,
is in like manner acted upon by the steam passing to the cylinder as soon as
the valve passage g opens to the cylinder passage i, and as the valve stop q
again leaves the tongue r, the clap n closes and the clap m opens for the next
supply of steam to the cylinder.
In Figures 9 and 10, is a bush through the valve chest; and t, a
spindle through the bush from the tongue r; across the bush 8, parallel
with the cylinder plate b, a slot is made in the bush 8, into which the
tongue r is admitted to the extent of half its length, and the other half
projecting into the valve chest is diminished in width equally on both
sides to a sharp edge, and the valve stop q, attached to the clap m, is dimi-
nished in width to the same angle. In its widest part the tongue r is equal
to the distance of motion given to the working valve, and in thickness the
valve stop 9 and the tongue r, taken together, are equal to the distance
the claps m and n are required to open. As the tonger is moved into or
drawn out of the valve chest, the valve stop 9 has more or less surface to pass
over, and the claps m and n being held open for a longer or shorter time,
more or less: steam is admitted to the cylinder, and by means of the spindle t
the tongue r may be so moved, either by hand gear or by a governor. In
Figure 10, u is a lever, supported by the bearer v, connected with the spindle
t, and by means of the rod:w, brought from an ordinary governor and attached
to the lever u, the tongue r is moved into or drawn out of the valve chest,
whereby the supply of steam to the cylinder is regulated expansively, as
explained in reference to Figure 9, and the speed of the engine is governed
without throttle. valve.
Figure 11 is a section of my improved slide expansion valve. a is the
working valve; b and c are supply steam passages .communicating with the
supply steam passages d and e.of the cylinder; f is the exhaust passage of
the valve, and g the exhaust passage of the cylinder. To the valve a, motion
is communicated by the spindle & from ordinary valve gear. On the valve a
is a stationary plate i, which has two steam passages, j and k, directly opposite
to the supply passages of the cylinder, to which steam is conveyed by the

page_text: supply passages of the valve a, from the passages j and k of the stationary
plate. On the stationary plate is a valve l, to which a reciprocating motion
is communicated by the spindle m, from being connected with uniform or
differential gear, and the valve is so made to cover and uncover alternately
the steam passages j and k of the stationary plate, whereby the supply of steam
to the cylinder is alternately intercepted, and may be so intercepted at any part
of the stroke without affecting the escape of the exhaust steam, as the motions
of the valve and the working valve are separated by the stationary plate.
Figure 12 is a section of my improved valve for the recovery of exhaust
steam. a is the working valve, to work in connection with the clap or slide
expansion valve above described; b and c are supply steam passages, to com-
municate with the supply passages of the cylinder; d is the exhaust passage
of the valve, to communicate with the exhaust cylinder passage; and fare
clap valves which open from the exhaust passage d into the supply passages b
and c. When the supply of steam to the cylinder is intercepted by covering
the supply passage b, and the pressure of steam in the cylinder is reduced
below atmospheric pressure, the pressure of steam in the passage b is reduced
to the same pressure, and the exhaust steam from the opposite end of the
cylinder opens the clap e, and enters that end of the cylinder which com-
municates with the passage b, and when the pressure of steam is in like
manner reduced in that end of the cylinder, communicating with the passage c,
the clap f is opened, and the exhaust steam from the opposite end of the
cylinder is admitted, and the loss of power from partial vacuum is prevented.
On Sheet 2, Figure 13 is a section of my improved expansion governor,
and Figure 14 an end view of the same. a is a shaft, supported in two
bearers b, b; c is a fly wheel, loose upon the shaft; and d, an excentric cam,
which is fast upon the shaft; e is a spring attached to the fly wheel, and press-
ing on the cam d; f is a bevil wheel fast upon the boss of the fly wheel c;
g is the valve cam, with a bevil wheel h fastened to it, the cam and the wheel
being loose upon the shaft; i is a bevel wheel, loose upon the stud j, which is
fast to the shaft a, and the bevil wheel i, acting as a carrier wheel, connects the
two bevil wheels f and h, and communicates from the fly wheel a reverse motion
to the valve cam, and by means of the rod acts upon the valve; lis the engine
shaft, on which the bevel wheel m, in connection with the bevel wheel n on
the shaft a, to which motion is communicated from the engine shaft l. As the
shaft a revolves, the fly wheel c is taken round by the spring c, and if the
velocity of the engine exceeds the velocity for which the spring is set, the fly
wheel by the resistance of its inertia recedes, and if the velocity diminishes,
the fly wheel by the force of the spring and its momentum advances; and by

page_text: means of a reverse motion communicated to the valve cam, the supply of steam-
to the cylinder is intercepted, sooner as the speed of the engine increases, or
later as it diminishes. n' is a notch in the cam, into which the end of the
spring enters, and from which it passes to the opposite side of the excentric,
when the motion of the engine is reversed, whereby the valve cam is reversed,
and the action of the valve changed to the reversed motion of the engine.
Figure 15 is a section, and Figure 16 a plan, of my improved double dis-
charge pressure valve for steam boilers. In Figure 15, a is the valve case;
6 is the upper, and c the lower part of the valve, faced to the seatings d and e;
f is the valve spindle, with a socket joint g, through which a pin is driven; k
is a cover to the valve b; i is an elbow pipe, to which the valve case a is
attached by means of the flanges j; is a spindle from the valve to the weight l;
the valve case attached to the pipe i is placed in a vertical position in the
boiler, supported by the flange m, which is bolted to the boiler top. The arca
of the valve c is greater than that of b, and the pressure of steam on c is
greater than the pressure on 6, in proportion to the difference of area. The
weight is proportioned to the difference of area in c and b, and the degree of
pressure required in the boiler; and when the difference of pressure on c and b
exceeds the weight 1, the valve c opens to the inside, and 6 to the outside of
the valve case a, into which the steam passes through the seatings d and e,
and escapes through the pipe i. Through the cover k to the valve 6 a steam
way is formed, which is less than the steam way through the seating d, in the
same proportion as the steam way through d is less than that of e, whereby, as
the pressure is diminished by escape of steam under the valvo c, the resistive
pressure upon 6 is diminished in the same proportion and a lift of the valve
is effected equal to the steam ways through the seatings d and e. On the
valve spindle are radial feathers p, which keep the valve in its place, seen in
Figure 16.
Figure 17 is a section of a valvo and apparatus for discharging excess of
water from steam boilers. a and b are the upper and lower parts of the valve,
which are of equal area; c is the valve spindle, with a slot d; e is a lever,
which passes through the slot d, and resting upon the valve spindle, is attached
to the fulcrum f; g is a float attached to the lever e, and h a balance weight
to the float g; i is the valve case attached to a straight pipe j, which, by means
of the flange k bolted to the boiler, supports the valve in a vertical position
inside the boiler. When the boiler is at full water, the valve case i is covered
with water, and the float g dips so far as to displace its own weight of water,
and from a further supply of water the float g rises, opens the valve a, b, and
allows water to escape from the boiler through the pipe j.

page_text: Figure 18 represents a valve and apparatus for diminishing the production
of steam.
a is the valve case, which has a valve similar to that of the double
discharge pressure valve; b is an elbow pipe, to which the valve case a is
attached, and supported in a vertical position inside the boiler by means of
the flange c bolted to the boiler top; d is the valve spindle, with a slot e; fis
a weight to the valve, proportioned to the difference of area in the upper and
lower part of the valve and the degree of pressure required in the boiler; gis
a lever, which rests upon the fulcrum h, and passes through the slot e in the
valve spindle; i is a float, suspended from the lever g, and j a balance weight
to the float i, which is immersed and set at a depth to which the water may be
reduced without injury to the boiler; k is a pipe outside the boiler, com-
municating with the valve, and carried to the ash-pit. When the water is
diminished so as to leave the float i, or the pressure of steam exceeds the
weight f, the valve is caused to open by the weight of the float or pressure of
steam which escapes from the valve, and is carried to the ash-pit by means of
the pipe k, in Figure 19. is a continuation of the pipe k outside the boiler
in Figure 18. Under the furnace bars l, and at the far end of the ash-pit,
the pipe k crosses the ash-pit, and from a number of holes in the pipe the
steam escapes and is spread in the ash-pit, from which it passes into the fur-
nace in place of air, and by reducing the heat of the furnace diminishes the
production of steam in the boiler.
Figure 20 represents the valve and apparatus for limiting the use of water
in steam boilers. a is the valve, which is similar in form, and has an inner
and outer case similar to those of the second form of throttle valve, before
described; is a pipe which carries steam from the boiler to the engine, and
at the mouth of the pipe 6 the valve a is attached inside the boiler; c is the
valve spindle, with a slot d; and e, a lever, which passes through the slot d, and
rests on the fulcrum f; g is a float suspended from the lover e, and h a balance
weight to the float 9, which is immersed in water, and set at a depth to which
the level of the water may be reduced without injury to the boiler. When
the water in the boiler is diminished so as to leave the float g, the float descends,
brings down the lever e, closes the valve a, which intercepts the supply of steam,
and stops the engine.
Having thus described the nature of my Invention, and the manner of
performing the same, I declare that I claim,―
First the construction of a throttle valve, on which the steam passing to the
engine is directed so to act as to assist in governing the engine, as explained
in reference to Figures 1 and 2, 3 and 4.
Secondly, the construction of an equilibrium throttle valve, which consists

page_text: of a circular and parallel rim contained in a circular and parallel recess, as
explained in reference to Figures 5 and 6.
Thirdly, the construction of a stop valve, which consists of a circular rim
with a flange to the rim, which valve is admitted into a circular recess, as
explained in reference to Figure 7.
Fourthly, the application of a clap valve as an expansion valve, to which
motion is communicated by the steam passing to the engine, and which is
regulated by a taper tongue in the valve chest in connection with hand gear
or a governor, as explained in reference to Figures 8, 9, and 10.
Fifthly, the application of a stationary plate betwixt a slide working valve
and a slide expansion valve, as explained in reference to Figure 11.
Sixthly, the application of a valve for the recovery of exhaust steam, as
explained in reference to Figure 12.
Seventhly, the application of a spring attached to a fly wheel, and pressing
on a cam as parts of an expansion governor, as explained in reference to
Figures 13 and 14.
Eighthly, the construction of a safety valve, on which the pressure of steam
acts to diminish weight, and on which the diminishing of pressure by escape
of steam is equalized, as explained in reference to Figure 15.
Ninthly, the application of an equilibrium valve and a float to discharge
excess of water from the boiler, as explained in reference to Figures 15
and 17.
Tenthly, the application of a valve and apparatus to discharge and convey
steam from the boiler to the ash-pit, to diminish the heat of the furnace and
the production of steam in the boiler when the pressure of steam in the
boiler is too high, or the water too low, as explained in reference to Figures 15,
18, and 19.
And, eleventhly, the application of a valve and a float to stop the engine
when the water in the boiler is too low, as explained in reference to Figures 5
and 20.
In witness whereof, I, the said Henry Hindle, have hereunto set my hand
and seal, this Twenty-first day of January, in the year of our Lord One
thousand eight hundred and fifty-seven.
HENRY HINDLE. (L.S.)
Witness,
H. B. BARLOW, Manchester.