Year: 1899

page_text: I, THOMAS CROSTON, of Hoquiam, in the County of Chehalis, and State of
Washington, United States of America, Steam Engineer, do hereby declare
the nature of this invention to be as follows:-
My invention is arranged to utilize the motive agent to the fullest advantage,
to govern the admission of the steam to the cylinder and piston according to and
from the load by way of the driving shaft, to govern the steam cut-off according
to the boiler pressure, and to permit of conveniently reversing the engine when-
ever desired.
The cylinder of the engine is provided with an abutment fitted with a spring-
pressed packing engaging the peripheral surface of a cylindrical piston which is
mounted to rotate in the cylinder and loosely on the main driving shaft the
latter having a yielding connection with the said piston to govern the admission
of steam to the cylinder and piston according to the load by way of said driving
shaft. The packing extends between side flanges on the piston and is preferably
made in four sections pressed by springs lengthwise against the flanges and
inward against the peripheral surface of the piston. The steam supply pipe opens
into the cylinder through one head and between the latter and one of the piston
flanges, the steam then passing through a valve seat into a cylindrical valve
secured to the shaft and mounted to turn in a central bore formed at one end
of the piston. The steam then passes through passages into chambers formed
diametrically opposite each other in the peripheral surface of the piston each
chamber containing a piston head pressed outward in frictional contact with
the inner surface of the cylinder by the live steam pressing against the inner end
of said piston head. The latter is made hollow and contains a port connecting
the chamber with a valve chamber connected with the interior of the cylinder
at opposite sides of the piston head, the connection being controlled by a valve.
in each piston head having top and bottom serrated flanges the valve being held
in either position by the pressure of the. live steam over the port exposed to the
exhaust. Thus the valves close the one port and open the other so that live
steam can pass from the chamber into the cylinder and press against the piston
head to rotate the piston. The cylinder is connected at opposite sides by exhaust
ports with exhaust valves under the control of the engineer and each connected
with exhaust pipes. The stem of one of the valves is provided with a hand
lever connected by a link with an arm on the stem of the other valve so that
when the hand lever is thrown over, the positions of the exhaust valves are
reversed. The inlet valve seat is provided with a cut-out portion and the
cylindrical cut-off valve rotating on said valve seat and rigidly secured to the
shaft, is provided with two oppositely-arranged ports adapted to connect the
cut-out portion of the valve seat with a passage so as to allow the steam to pass
from the end of the cylinder to the passage before one of the ports of the cut-off

page_text: valve leaves the cut-out portion and closes on the peripheral part of the said
valve seat. The steam then admitted into the cylinder to act on the correspond-
ing piston head acts expansively and the steam in front of the piston head
exhausts through the exhaust valve...
.
By setting the steam cut-off at one-eighth of a revolution of the piston the
load is thrown on the engine when the load cut-off valve will travel in an opposite
direction until a load spring herinafter described equals the power thrown on
the engine and so on until the cut-off occurs at one-half revolution of the working
travel of the piston head. By shifting the position of the valve seat steam can
be admitted to the left hand or right hand side of the cylinder by way of the
chambers and piston heads so that the engine can be run in either a forward
or reverse direction. For this purpose the inlet valve seat forms a reversing
valve and it is connected by spur and worm gearing with a hand wheel whereby
the valve seat may be rotated so as to move. the same into proper position for
running the engine forward or backward. The hand wheel is journalled loosely
on a shaft which carries a bevel gear wheel which meshes with a bevel gear wheel
mounted loosely on the enlarged end of a piston rod carrying a piston fitted to
slide in a cylinder connected by a branch pipe with the steam supply pipe so
that the motive agent can pass under boiler pressure into the supply pipe and
into the upper end of the cylinder to press on the piston and force the sanie in a
downward direction against the tension of a spring. On the piston rod is secured
a pin carrying a diamond-shaped shoe mounted to travel in a vertically-disposed
slot formed in the enlarged end of the piston rod, said slot terminating in
diverging slots forming with the vertical slot a Y-shaped slot. A pin in the
fixed portion of the bearing or guideway for the piston rod engages a vertically-
disposed slot in the enlarged end so as to prevent the latter from turning but
allow an up and down movement thereof. By this means when the boiler
pressure increases beyond a normal pressure, the piston is forced downward
beyond its normal position causing the piston rod and its enlargement to move
in a like direction, so that either of the grooves turn the bevel gear wheels
and rotary motion is transmitted to the valve seat so that the latter changes
position relatively to the cut-off valve according to the increase in the boiler
pressure and consequently the cut-off takes place sooner on an increase of pressure.
A like result in a reverse direction takes place when the boiler pressure decreases,
as the spring pushes the piston rod upward and the valve seat is moved in such
position relative to the cut-off valve that the cut-off takes place later and more
steam is admitted to the cylinder. A branch pipe provided with a valve is
arranged to normally connect with the interior of the cylinder but the valve
body has an outlet to the open air so that when it is desired to reverse the
engine the said cylinder is connected with the outer air while the steam is cut
off from the cylinder to permit of conveniently reversing the engine. The valve
is actuated from a link and for this purpose the stem of the valve is provided
with an arm connected by a link with one of a pair of forks secured on said link.
When the hand lever is thrown over in one direction one of the forks causes a
pull to be exerted on the arm on the valve and the valve is shifted to disconnect
the cylinder from the supply pipe. The spring now pushes the piston into an
uppermost position so that the shoe stands in the vertical slot and holds the
bevel gear wheel against rotation to permit of shifting the valve scat by means
of the hand wheel turned by the operator. When the engine is reversed and
the lever is thrown over in the other direction the other fork causes the valve to
be moved into proper position.
The piston of the engine is provided with a bore somewhat larger than the
bore containing the cut-off valve and in this bore is arranged a vielding connec-
tion between the shaft and the piston. This yielding connection is provided
with two discs held loosely on the shaft and provided with friction rollers engaged
by projections extending from the wall of the bore inwardly so that when the
piston is rotated the projections carry the discs along. The discs are loosely

page_text: connected with each other by rods arranged to permit the discs to slide toward
or from each other for the purpose hereinafter more fully described. One of
the discs supports an intermediate disc by means of screw rods mounted to turn
loosely in one disc and screwing into the other disc to move the latter closer to,
or farther from, the former disc and regulate the tension of a spring coiled on
the shaft and extending between the other end disc and the intermediate disc.
The end discs are provided at their hubs with inwardly projecting pins adapted
to engage annular grooves formed on the shaft and also spiral grooves extending
between the annular grooves. The rods are of such a length that the discs
cannot move further apart, so that one of the discs has its pin in an annular
groove while the other disc has its pin in a spiral groove.
+
Now when the load on the shaft increases beyond a normal load then the shaft
drags relatively to the piston and in doing so one of the said discs is caused to
travel inward toward the other end disc at the time the pin causes the piston to
rotate to bring the piston in 'such relative position to the cut-off valve that the
cut-off takes place later so as to allow more steam to pass into the cylinder for
overcoming the increase in the load; and in case the load decreases, the disc
moves outwardly by the tension of the spring and consequently said disc tends
to turn the piston faster to cut-off sooner on the valve and reduces the amount
of steam passing into the cylinder. In either case the spring tends to equalize
the discrepancy between the pressure of the steam in the cylinder and the load
connected with the shaft so that the disc moves correspondingly and consequently
the admission of steam to the cylinder and piston is governed according to and
from the load by way of the driving shaft. When the engine is reversed the
action is the same as above described, the only difference being that it is the
other disc that moves against the tension of the spring for the purpose set forth.
In order to indicate the position of the shaft relatively to the piston by the
yielding connection above referred to, I provide a ring engaged by a pin carried
on the piston. The pin is provided with an inwardly projecting pin engaging a
spiral groove formed in a cam secured to the shaft within the cylinder. The
ring engages a wedge provided with a rod fitted to slide in suitable bearings
and pressed on by a spring for holding the wedge in frictional contact with
the ring. The upper end of the rod carries a pawl in mesh with a cog wheel
secured on a shaft mounted to turn in suitable bearings. On the outer end of
the shaft is secured a pointér indicating on a graduation.
Now when the shaft rotates slower than the piston then the projection travelling
in the cam groove causes the ring to slide outward on the pin and in doing so
the ring pushes the wedge outward against the tension of the spring and the
outward movement of the wedge causes the rod and pawl to turn the ratchet
wheel and shaft and move the pointer on the graduation to indicate the difference
in position between the shaft and the piston.
Dated this 22nd day of September 1899

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
-
The object of my invention is to provide a new and improved rotary engine,
arranged to utilize the motive agent to the fullest advantage, to govern the
admission of the steam to the cylinder and piston according to and from the load
by way of the driving shaft, to govern the steam cut off according to the boiler
pressure, and to permit of conveniently reversing the engine whenever desired.
The invention consists of novel features and parts and combinations of the
same, as will be described hereinafter and then pointed out in the claims.
Reference is to be had to the accompanying drawings forming a part of this
specification, in which similar characters of reference indicate corresponding parts
in all the figures.
Figure 1 is a sectional side elevation of the improvement;
Figure 2 is a sectional plan view of the same, on the line 2-2 of Figure 3;
Figure 3 is a transverse section of the same, on the line 3-3 of Figure 1;
Figure 4 is a similar view of the same, on the line 44 of Figure 1;
Figure 5 is an end view of the improvement, with parts of the admission
regulator in section;
Figure 6 is a cross section of the valve gear in a reversed position;
Figure 7 is an enlarged sectional side elevation of the reversing indicator,
with parts in section;
Figure 8 is an enlarged sectional side elevation of the valve for the admission
regulator;
Figure 9 is a cross section of the load indicator, the section being taken on
the line 9-9 of Figure 1; and
Figure 10 is an enlarged side elevation of the piston rod for the admission
regulator.
The improved automatic rotary engine is provided with a cylinder A, having
heads A', A2 and an abutment portion A3, in which is fitted a spring-pressed
packing B, engaging the peripheral surface of a cylindrical piston C, mounted
to rotate in the cylinder A and loosely on the main driving shaft D, the latter
having a yielding connection with the said piston, as hereinafter more fully
described, to govern the admission of steam to the cylinder and piston, according
to the load, by way of said driving shaft D. The packing B extends between the
side flanges C¹ of the piston C, and said packing is preferably made in four
sections B¹ (see dotted lines in Figure 1) pressed lengthwise by springs 132
against the flanges C and inward against the peripheral surface of the piston C
by springs B. A supply pipe E connected with a suitable source of steam supply,
opens into the cylinder at the head A2 between the latter and one of the piston
Hanges C, the steam then passing from this end of the cylinder through a valve
seat F, into a cylindrical valve G, secured to 'the shaft D and mounted to turn
in the central bore C+ formed at one end of the piston C.
The steam passes
from the valve G through passages C into chambers C³, formed diametrically
opposite each other in the peripheral surface of the piston C, each chamber
containing a piston head H, pressed outward in frictional contact with the inner
surface of the cylinder A by the live steam passing into the chamber C³ and
pressing against the inner end of said piston head. The latter is made hollow
and contains a port a, connecting the chamber C3 with a valve chamber H',
connected by ports b and c with the interior of the cylinder at opposite sides of
the piston head. A valve I in each piston head is provided with top and bottom
serrated flanges I¹, adapted to close or open the ports b and c, the valve being
held in either position by the pressure of the live steam over the port exposed
to the exhaust, as will be readily understood by reference to Figure 3. Thus,
as shown at the right in Figure 3, the valves I close the port c and open the
port b, so that live steam can pass from the chamber C³ by way of the ports a
and into the cylinder A, and press against the piston head at the time the

page_text: latter is moving into a left-hand position, to rotate the piston in the direction of
the arrow a', see Figure 4. The cylinder A is connected at opposite sides by
exhaust ports d, d with exhaust valves J, J, respectively, under the control of
the engineer, and connected with exhaust pipes J2, J³, respectively. The stem
of the valve J is provided with a hand lever J (Figure 5) connected by a link J
with an arm J on the stem of the other valve J, so that when the hand lever J*
is thrown over by the engineer, the positions of the exhaust valves J, J', are
reversed. As shown in Figure 3, the valve J is in a closed position and conse-
quently inactive; while the valve J is open, the exhaust steam passing through
it when the piston C travels in the direction of the arrow a¹. The hand lever J*
is provided with a locking lever J7 adapted to be locked on a notched segment JB,
for holding the lever in proper position.
The valve seat F is provided with a cut-out portion F¹ (Figures 4 and 6) and
the cylindrical cut-off valve G rotating on said valve seat and rigidly secured to
the shaft 1), is provided with two oppositely arranged ports e, e', adapted to
connect the cut-out portion F1 of the valve seat with the corresponding passage C²,
to allow the steam to pass from the end of the cylinder through the cut-out
portion and the port e or e¹ to the passage C2, before the port e or el leaves the
cut-out portion and closes on the peripheral part of the said valve seat. The
steam then admitted into the cylinder to act on the corresponding piston head
acts expansively, and the steam in front of the piston head exhausts through
the port d, exhaust valve J¹ and the exhaust pipe J³.
By setting the steam cut-off at one-eighth of a revolution of the piston C, the
load is thrown on the engine, when the load cut-off valve will travel in an
opposite direction, as shown by the arrow in Figure 6, until the load spring R
(Figure 1) hereinafter further described, equals the power thrown on the engine,
and so on until the cut-off occurs at one-half revolution of the working travel of
the piston head H.
It is evident that by shifting the position of the valve seat F from that shown
in Figure 4, to the position shown in Figure 6, steam can be admitted to the
left-hand or right-hand side of the cylinder A by way of the chambers C3 and
piston heads A1, A2, as explained, so that the engine can be run in either a
forward or reverse direction. For this purpose the valve seat F forms a reversing
valve, and is provided with a gear wheel F2 in mesh with a gear wheel F,
secured on a shaft 14 journaled in the head A² and provided at its outer end
with a worm wheel K (see Figure 7) in mesh with a worm K', secured or formed
on a shaft K2 mounted to turn in suitable bearings in a frame K³, and carrying at
one end a pinion K in mesh with a gear wheel , formed on the edge of a hand
wheel K, under the control of the engineer for turning said hand wheel and
rotating the worm K¹, worm wheel K, shaft F and gear wheels F3, F2, to rotate
the valve seat F', so as to move the same into proper position for running the
engine forward or backward. The hand wheel K is journaled loosely on a
shaft K close to the bevel wheel L.
The bevel gear wheel L is secured on the shaft K' and is in mesh with a bevel
gear wheel L, mounted loosely on the enlarged end N¹ of a piston rod N², carrying
a piston N fitted to slide in a cylinder N³, connected by a branch pipe N+ with
the steam supply pipe E, so that the motive agent can pass under boiler pressure
into the supply pipe E and into the upper end of the cylinder N to press on the
piston N and force the same in a downward direction against the tension of the
spring No, held on the piston rod N2. A nut on the latter serves to regulate
the tension of the said spring. In the hub of the bevel gear wheel L¹ is secured
a pin L², carrying a diamond-shaped shoe L³, (see Figure 10) mounted to travel
in a vertically disposed slot N6, formed in the enlarged end N₁ of the piston
rod N2, said slot terminating in diverging slots N7, N8, forming with the slot No
a Y-shaped slot, as will be readily understood by reference to Figure 10. A
pin N° (Figure 1) in a fixed portion of the bearing or guideway for the piston

page_text: rod N, engages a vertically disposed slot in the enlarged part N', so as to prevent
the latter from turning, but allow an up and down movement thereof.
Now it is evident that when the boiler pressure. increases beyond a normal
pressure, the piston. N is forced downward beyond its normal position, causing
the piston rod N2 and its enlargement N¹ to move in a like direction, so that
either of the grooves N or N8 turns the bevel gear wheel L¹ by means of the
shoe L³, and consequently a rotary, motion is given to the bevel gear wheel L
which turns the shaft K and frame and turns the shaft by the worm K¹
and worm wheel K. The rotary motion of the, shaft F is transmitted by the
gear wheels F, to the valve seat F, so that the latter changes position
relatively to the cut-off valve G, according to the increase in the boiler pressure,
and consequently the cut-off takes place sooner on an increase of pressure.
A like result in a reverse direction takes place when the boiler pressure decreases,
as the spring No pushes the piston rod N2 upward, and the gear wheel L' is
turned in the opposite direction, to move the vaive seat Fin such position relative
to the cut-off valve G that the cut-off takes place later and more steam is admitted
to the cylinder.
'
In the branch pipe N is a valve O, arranged to normally connect the branch
pipe N with the interior of the cylinder, as shown in Figures 5 and 8, but the
valve body has an outlet to the open air, so that when it is desired to reverse
the engine, the said cylinder is connected with the outer air, while the steam is
cut off from the cylinder, to permit of conveniently reversing the engine. The
valve O is actuated from the link J, and for this purpose the stem of the valve
is provided with an arm 0', connected by a link 02 with either the fork 03 or
the fork 04, secured on said link J. When the lever J is thrown into the
position shown in dotted lines in Figure 5, the link J5 by means of the fork O
lifts the link O2, so that a pull is exerted on the arm 0¹ and the valve O is shifted
to disconnect the cylinder N³ from the supply pipe E. The spring N³ now pushes
the piston N into an uppermost position, so that the shoe L stands in the vertical
slot N and holds the bevel gear wheel L' against rotation, to permit of shifting
the valve seat F by means of the hand wheel K", turned by the operator. When
the engine is reversed and the lever J is thrown over to the left on the
segment J8, the other fork 04 engages the link 02 and moves the valve 0 into
proper position.
On the shaft F* is secured a pointer P, indicating on a graduation P¹ fixed
on the outside of the cylinder head A2, so as to indicate the position of the valve
seat Frelatively to the cut-off valve G. See Figure 1.
The piston C is provided with a bore C³, somewhat larger than the bore C
containing the cut-off valve G, and in this bore is arranged a yielding connection
between the shaft D and the piston C. As illustrated in the drawings, the
yielding connection referred to is provided with two disks Q, Q', held loosely on
the shaft D, and provided with friction rollers Q2 engaged by projections C
extending from the wall of the bore C³, inwardly, as is plainly shown in Figure 3,
so that when the piston C is rotated, the projections carry the disks Q, Q¹ along.
The disks Q, Q¹ are loosely connected with each other by rods Q³, arranged to
permit the disks to slide toward or from each other for the purpose hereinafter
more fully described. The disk Q₁ supports a second disk Q4 by means of screw
rods Q mounted to turn loosely in the disk Q¹, and screwing in the disk Q4, to
move the latter closer to or farther from the disk Q¹ and regulate the tension
of a spring R, coiled on the shaft D and extending between the disk Q* and
the disk Q. The disks Q, Q are provided at their hubs with inwardly projecting
pins Q, Q, respectively, adapted to engage annular grooves D1, D2 formed
on the shaft D, and also spiral grooves D³ extending between the annular
grooves D, D. The rods Q3 are of such a length that the disks Q, Q¹ cannot move
further apart so that one of the disks has its pin in an annular groove, while
the other disk has its pin in a spiral groove. For instance as shown in Figures 1
and 2, the disk Q has its pin Q in the annular groove D¹, while the other disk Q¹

page_text: has its pin Q7 in a spiral groove D³. When the engine is reversed, the pin Q
of the disk Q extends in the annular groove D2, while the pin Q of the disk Q
engages one of the spiral grooves D³.
Now when the load on the shaft 1) increases beyond a normal load, the shaft D
drags relatively to the piston C, and in doing so, the disk Q', (see Figures 1
and 2) is caused to travel inward toward the disk Q at the time the pin Q7 causes
the piston C to rotate to bring the piston in such relative position to the cut-off
valve G that the cut-off takes place later, so as to allow more steam to pass into
the cylinder, for overcoming the increase in the load; and in case the load
decreases, the disk Q₁ moves outwardly by the tension of the spring R, and
consequently said disk tends to turn the piston C faster to cut off sooner on the
valve G, and reduces the amount of steam passing into the cylinder. In either
case the spring R tends to equalize the discrepancy between the pressure of the
steam in the cylinder and the load connected with the shaft 1), so that the
disk moves correspondingly, and consequently the admission of steam to the
cylinder and piston is governed according to and from the load by way of the
driving shaft. When the engine is reversed the action is the same as above
described, the only difference being that it is the disk Q that moves toward
and from the other disk Q', but against the tension of the spring R, for the
purpose set forth.
In order to indicate the position of the shaft 1) relatively to the piston by
the yielding connection above referred to, I provide a ring S, engaged by a pin $1
carried on the piston C. The pin S¹ is provided with an inwardly projecting
pin S, engaging a spiral groove $ formed in a cam $4, secured to the shaft I)
within the cylinder A next to the head A¹. The ring S engages a wedge T
(Figure 1) provided with a rod T, fitted to slide in suitable bearings in the
head A', and pressed on by a spring T2. for holding the wedge T in frictional
contact with the ring. The upper end of the rod T carries a pawl T3 (Figure 9)
in mesh with a cog wheel T4, secured on a shaft T5 mounted to turn in suitable
bearings in the said head A. On the outer end of the shaft T is secured a
pointer T, indicating on a graduation T7 on the outer face of the head A¹.
Now when the shaft D rotates slower than the picton C, the projection $2
travelling in the cam groove $3 causes the ring S to slide outward on the pin S',
and in doing so the ring pushes the wedge T outward against the tension of the
spring T2, and the outward movement of the wedge causes the rod T and pawl T³
to turn the ratchet wheel T and shaft T5, and move the pointer T6 on the
graduation T7 to indicate the difference in position between the shaft D and the
piston C.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A rotary engine provided with a main shaft, a cylinder, a piston mounted
therein loosely on the main shaft, a disk connected with the piston to rotate
therewith, a guide secured to the shaft and extending obliquely in relation
to its axis, another disk mounted to rotate with the piston and having a projec-
tion engaging the said oblique guide, said second-named disk being movable
longitudinally of the shaft, toward and from the other disk, and a spring located
between the two disks.
2. A rotary engine provided with a main shaft, a cylinder, a piston mounted
therein loosely on the main shaft, a disk connected with the piston to rotate
therewith, a guide secured to the shaft and extending obliquely in relation
to its axis, another disk mounted to rotate with the piston and having a projec-
tion engaging the said oblique guide, said second-named disk being movable
longitudinally of the shaft, toward and from the other disk, a cut-off valve
positively connected with the shaft and cooperating with ports in the piston, and
a spring located between the two disks.

page_text: 3. A rotary engine, provided with a cylinder, a piston mounted therein, a
cut-off valve for the steam to said cylinder and piston, a main driving-shaft
controlling said valve, a yielding connection between said shaft and piston,
and a reversing-valve operating in conjunction with the admission-valve, and
under the control of the engineer, substantially as shown and described.
4. A rotary engine, provided with a cylinder, a piston mounted therein, a
cut-off valve for the steam to said cylinder and piston, a main driving-shaft
controlling said valve, a yielding connection between said shaft and piston,
said yielding connection comprising disks engaged by and carried around by
said piston, one of the disks being fitted to slide in spiral grooves on said shaft,
and a spring pressing the disks apart, substantially as shown and described.
5. A rotary engine, provided with a cylinder, a piston mounted therein, a
cut-off valve for the steam to said cylinder and piston, a main driving-shaft
controlling said valve, a yielding connection between said shaft and piston,
said yielding connection comprising disks engaged by and carried around by
said piston, one of the disks being fitted to slide in spiral grooves on said shaft,
a spring pressing the disks apart, and means for regulating the tension of said
spring, substantially as shown and described.
6. A rotary engine, provided with a cylinder, a piston mounted therein, a
cut-off valve for the steam to said cylinder and piston, a main driving-shaft
controlling said valve, a yielding connection between said shaft and piston,
said yielding connection comprising disks engaged by and carried around by
said piston, one of the disks being fitted to slide in spiral grooves on said shaft,
a spring pressing the disks apart, and a loose connection between said disks,
for shifting the same simultaneously and automatically on reversing the engine,
substantially as shown and described.
7. A rotary engine provided with a piston having a piston-head with ports on
opposite sides, and a valve in said piston-head, for closing one port and opening
the other, the valve being controlled by the pressure of the steam, substantially
as shown and described.
8. A rotary engine, provided with a piston having a piston-head with ports on
opposite sides, and a valve in said piston-head, for closing one port and opening
the other, the valve being controlled by the pressure of the steam passing from
the interior of the piston through a port into the valve-chamber in the piston-
head, substantially as shown and described.
9. A rotary engine, provided with a cylinder, a piston mounted to turn
therein, a main driving-shaft on which the piston rotates loosely, a yielding
connection between the said shaft and the said piston, and an indicator connected
with the said shaft and piston, to indicate the differential position of the two,
substantially as shown and described.
10. An engine, comprising a main shaft, a rotary piston loose on said shaft,
a valve rigidly secured to the shaft and controlling ports of the piston, and a
yielding connection between the shaft and piston.
11. A rotary engine provided with a reversing device consisting of a valve
chamber with ports at opposite sides, and a valve in said chamber for closing one
port and opening the other, the valve being controlled by the pressure of live
steam over the port exposed to atmosphere, substantially as shown and described.
12. A rotary engine provided with a cut-off valve revolving on a revoluble
valve seat, a regulator controlled by the boiler pressure and connected with the
valve. seat, to turn the latter according to the increase or decrease of the boiler
pressure, substantially as shown and described.
13. A rotary engine provided with a cut-off valve revolving on a revoluble
valve seat, a regulator controlled by the boiler pressure and connected with the
valve seat, to turn the latter according to the increase or decrease of the boiler
pressure, said regulator comprising a cylinder containing a piston and connected
with the boiler pressure, a gearing connected with said valve seat, and means

page_text: for turning said gearing from the piston rod-of said piston on the movement of
the latter in the cylinder, substantially as shown and described.
14. A rotary engine provided with a cut-off valve revolving on a revoluble
valve seat, a regulator controlled by the boiler pressure and connected with, the
valve seat to turn the latter according to the increase or decrease of the boiler
pressure, a valve in the supply pipe for said regulator and an exhaust reversing
device connected with said valve for controlling the valve and the regulator on
reversing the engine, substantially as shown and described.
Dated this 25th day of April 1900
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.