Improvements in and Connected with Apparatus for Actuating the Valves of Certain Steam-engines and other Engines Actuated by the Pressure of Fluids.
Year: 1887

page_text: Improvements in and Connected with Apparatus for Actuating the
Valves of Certain Steam-engines and other Engines Actuated by
the Pressure of Fluids.
We GEORGE PETRIE of Phoenix Foundry Rochdale in the county of Lancaster
Engineer and GEORGE DOWELL of the same place Engineer do hereby declare the
nature of this invention to be as follows:-
Our invention relates firstly to those steam-engines and other engines actuated by
the pressure of fluids which are provided with piston-valves each having a plain edge
which controls the "exhaust" and provided with projections or openings which
operating in conjunction with a corresponding number of openings in the casing
within which the valve works and by the partial turning of the valve control the
admission of steam or other fluid to the cylinder and our invention consists firstly in
a method of and arrangements of apparatus for operating such valves aforesaid.
Rectilinear motion is imparted to the valves in the usual manner by an eccentric
and rod or rods and the usual swivel arrangement by which the valves are rendered
capable of being turned while being moved longitudinally.
It has hitherto been customary when employing valves of the class above mentioned
to "couple" the valves for both "ends of the cylinder rigidly and turn them
together, the " time of the "cut off" being regulated from the governor through
a series of spur, worm and bevel wheels.
39
By our invention the valves at each "end" of the cylinder are so arranged that
while such valves are receiving rectilinear motion the said valves may each be caused
to be partially rotated independently of the other and we cause each valve to close or
"cut off" quickly at any part of the "stroke" of the piston by means of a spring
acting in conjunction with a "dash pot," the point of the "stroke "of the piston at
which the cut off" takes place being controlled by means of a 'governor'
actuated by the engine.
GC
"
وو
each of
In carrying this part of our invention into effect we connect the two piston-valves
by means of a socket into opposite ends of which we secure glands
which "glands" is formed in two portions and furnished with recesses which when
the glands are screwed into the socket above mentioned embrace collars formed on
the valve spindles. We secure each of the " glands" previously mentioned in the

page_text: socket aforesaid by means of lock-nuts. The "glands" and lock nuts aforesaid
enable either of the valves to be adjusted lengthwise without moving the other valvo.
The collars above mentioned upon the valve spindle and the recesses in the "glands
permit either of the valves to be partially rotated independently of the other while
the said valves are being moved longitudinally.
In those cases in which valves of the class above referred to are enclosed in separate
valve-boxes at or near each end of the cylinder we place between the valve boxes a
slide upon which is mounted a frame capable of being moved longitudinally by means
of the eccentric and connect the valve spindles to the said frame, so that while the
valve spindles are being moved longitudinally by the eccentric they may be partially
rotated independently of each other."
"
A further portion of our invention relates to arrangements of apparatus by means
of which we turn the valves of the class above referred to, in one direction for the
admission of steam or other fluid to the cylinder, and to arrangements of apparatus
by which the steam or other fluid is "cut off" at any desired portion of the "stroke
of the engine by means of a spring. Upon a shaft hereinafter referred to as the
cam shaft driven by means of gearing from the crank shaft of the engine, we mount
two cams, one cam operating the valve at one end of the cylinder and the other cam
operating the valve at the remaining end of the cylinder. As the parts operated by
each of the above mentioned cams are similar in construction and operation to those
operated by the other of the said cams we shall for convenience only refer to the
parts operating one of the valves. Upon suitable guides we mount a frame which
frame is moved by means of one of the cams before mentioned. Carried by the
frame previously mentioned and capable of being slidden thereon is a block provided
with a catch which at times acts upon a projection on a rod which rod by means of
suitable rods and levers is connected to a lever through one end of which one of the
valve spindles above referred to may be moved longitudinally, and which lever is
capable of turning the valve attached to the said valve spindle by means of a square
portion formed upon the said valve spindle or by means of a slot and key or by any
other suitable means. The lever above mentioned is prevented from moving sideways
by means of a bracket attached to any suitable fixed part. Carried by the frame
above mentioned and jointed thereto is a lever turned in one direction by means of a
spring. One arm of the said lever passes into a slot or recess formed in the block
before mentioned, the remaining arm of the said lever being formed so as to constitute
an incline. Upon the cam shaft before referred to we mount an eccentric which by
means of rods and levers imparts a to and fro motion to a rod carrying a bowl or
roller which acts upon the lever carried by the frame previously mentioned so as to
withdraw the catch before mentioned from the projecting part upon the rod above
referred to. As the cam before mentioned rotates the frame previously referred to
will be moved and the catch upon the block carried by the said frame arriving against
the projecting part upon the rod aforesaid will move such rod and thereby turn the
valve to admit steam or other fluid into the cylinder. A further turning of the cam
shaft will by means of the eccentric thereon cause the bowl or roller previously
mentioned to act against the arm above referred to and turn it against the force of the
spring before named and withdraw the catch from the projection on the rod previously
referred to, which being liberated will by means of the spring aforesaid be moved in
a direction opposite to that in which it was previously moved by the cam, and thereby
"cut off" the steam or other fluid.
To enable the "governor to determine the portion of the "stroke" at which
the "cut off" shall take place we cause the " governor" by means of suitable rods
and levers to move the bowl or roller before mentioned, to cause it to act upon the
inclined portion of the lever previously referred to so as to withdraw the catch from
the projection earlier or later thereby leaving the valve at liberty to be turned by the
spring and "cut off" the steam or other fluid.
"
i
In order to prevent the springs which close the valves from closing such valves too
suddenly and to avoid shock we govern "the closing of each of such valves by
means of a "dash pot" of any suitable kind

page_text: A modification of our invention which we propose to employ in some cases is as
follows Upon a shaft between the valve boxes we place a cam revolving at the same
speed as the crank shaft of the engine but in a horizontal plane. The said cam causes
a frame mounted upon or in suitable guides to be traversed longitudinally. To the
frame aforesaid are fixed catch-pieces which at times engage with corresponding
catch-pieces on rods connected to levers for turning the valves to admit steam or
other fluid to either "end" of the cylinder. To the sliding frame before mentioned
are jointed levers one end of each of which by being moved may disengage the
catches before referred to. The remaining ends of the levers above referred to are
made in a curved form so as to project within the range of a cam or disc by which
the "time" of the "cut off" is regulated which cam is hereinafter referred to as
the "cut off cam and is rotated by the shaft above mentioned or any other shaft
revolving at the same speed as the crank-shaft of the engine. We connect the
cut off cam "
to the governor in any convenient manner. The governor bymoving
the "cut off cam" longitudinally upon the shaft upon which it is mounted causes the
said "cut off cam "
to act upon one or other of the projecting ends of the levers
operating in conjunction with the catches above-mentioned so as to disengage one or
other of the said catches from one or other of the valve-spindles, thereby leaving one
or other of the valves at liberty to be rotated by a spring to "cut off" the steam
from one or other "end" of the cylinder, the action of such spring being governed
by means of a "dash-pot" of any suitable construction.
د,
The hereinbefore described arrangements of apparatus are also applicable for
operating "Corliss valves and flat rotating or circular slide valves.
دو
Dated this Twenty-ninth day of T 1007
W. T. CHEETHAM,
Carlton Chambers,
18, Saint Ann's Street, Manchester,
Agent to the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in and Connected with Apparatus for Actuating the
Valves of Certain Steam-engines and other Engines Actuated
by the Pressure of Fluids.
We GEORGE PETRIE of Phoenix Foundry Rochdale in the County of Lancaster
Engineer and GEORGE DOWELL of the same place Engineer do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
Our invention relates firstly to those steam-engines and other engines actuated by
the pressure of fluids which are provided with piston-valves each having a plain edge
which controls the "exhaust" and provided with projections or openings which,
operating in conjunction with a corresponding number of openings in the casing
within which the valve works, and by the partial turning of the valve control
the admission of steam. or other fluid to the cylinder and our invention consists
firstly in a method of and arrangements of apparatus for operating such valves
aforesaid.
Rectilinear motion is imparted to the valves in the usual manner by an excentric
and rod or rods and the usual swivel arrangement by which the valves are rendered
capable of being turned while being moved longitudinally.
It has hitherto been customary when employing valves of the class above-
mentioned to "couple" the valves for both "ends" of the cylinder rigidly and turn
them together the "time" of the "cut off" being regulated from the "governor'
through a series of spur, worm and bevel wheels.
"
By our invention the valves at each "end" of the cylinder are so arranged that
while such valves are receiving rectilinear motion the said valves may each be caused
to be partially turned independently of the other and we cause each valve to close
"cut-off" quickly at any part of the "stroke" of the piston by means of a
spring acting in conjunction with a "dash pot," the point of the "stroke" of the
piston at which the "cut off" takes place being controlled by means of "governor'
actuated by the engine.
or
66
23
In carrying this part of our invention into effect we connect the two piston-valves
by means of a socket into opposite ends of which we secure glands" each of
which "glands" is formed in two portions and furnished with recesses which when
the "glands" are screwed into the socket above-mentioned embrace collars formed on
the valve spindles. We secure each of the "glands" previously mentioned in the
socket aforesaid by means of lock-nuts. The glands and lock-nuts aforesaid enable
either of the valves to be adjusted lengthwise without moving the other valve. The
collars above mentioned upon the valve spindle and the recesses in the "glands
permit either of the valves to be partially rotated independently of the other while the
said valves are being moved longitudinally.
"
In order that our invention may be understood and readily carried into effect we
have hereunto annexed drawings throughout the whole series of figures in which we

page_text: parts. LII
the
have employed the same letters of reference to indicate the same
drawings hereunto annexed Fig. 1 is a longitudinal section of so much of a steam-
engine as is requisite to illustrate the first part of our invention, a is the valve-
casing of a steam-cylinder b, secured to the valve-casing a are the shells c. c in
which the piston-valves d respectively work. Secured by one end to the valve dat
the end A of the cylinder b in the usual manner is the valve-spindle e and
secured in like manner to the valve d at the end B of the cylinder bis the other
valve-spindle e. The one valve-spindle e terminates at C and the other valve-spindle e
terminates at D. We form upon the spindles e. e. collars f. f respectively such
collars ff being preferably solid. Surrounding the collars f. fis a socket g. Into
the socket g are screwed glands h. h. The glands h h are each formed in two portions
shown more clearly in Fig. 2 which is a cross-section taken on the line E F of
Fig. 1. The exteriors of the glands h. h and the interior of the socket g are formed
with screw threads. In the inner portions of the glands hh are formed recesses.
The recess in one of the glands h. h is caused to embrace one of the collars ff and
the said gland is screwed into the socket g. The recess formed in the other gland h
is caused to embrace the other collar and the said gland his screwed into the
socket 9. By means of the socket g and glands h either of the valves d d may be
adjusted lengthwise without moving the other valve d. We provide the glands h
with lock-nuts j. j such lock-nuts j. j securing the glands in position after such
glands have been adjusted into position in the socket g. The collars and the
recesses in the glands h h permit either of the valves d d to be partially rotated
independently of the other while the valves d d are being moved longitudinally.
The flanges at the ends of the glands h h and the lock-nuts j. j may be made
hexagonal as shown, so that they may be turned by means of a spanner or they may
be made round and be provided with holes so that they may be turned by means of
a bar.
Formed through the casing a is an opening k by means of which access is
obtained to the socket y and the parts connected therewith. The opening k is.
closed by means of a cover secured to the casing by means of bolts and nuts.
In some cases we employ the arrangement of apparatus shown by Fig. 3 for
connecting the valve-spindles e and e together. Secured to the one valve-spindle e by
the cotter g is a socket y. Upon the other valve-spindle e we form a collar f. The
gland his formed in two portions similarly to the glands h h previously described
and is capable of being screwed into the socket g. The gland h is formed with a recess
which embraces the collar and the said gland his secured in the socket by means
of a lock-nut j. When this form of "coupling" is employed care must be taken
that the single collar is formed with sufficient surface to prevent undue wear from
taking place.
. In those cases in which valves of the class above referred to are enclosed in
separate valve-boxes at or near each end of the cylinder as shewn by Figs. 4 and 5,
Fig. being a side view shewing so much of a steam-engine as is requisite to
illustrate this portion of our invention and Fig. 5 a cross section of that which is
shown in Fig. 4 taken upon the line G, H of Fig. 4 we place between the valve-
boxes l. a slide or guide-plate m secured to the framework n of the engine. Upon
the slide m is mounted a frame o capable of being moved longitudinally in any
convenient manner by means of the excentric of the engine. Formed upon the
frame o are two bosses o¹. o¹. One valve-spindle e passes through a hole formed in
one of the bosses o¹. We provide the said valve-spindle e with washers p.and a bush q
indicated in Fig. 4. by dotted lines. Upon the valve-spindle e we form screw threads
capable of being screwed upon which are nuts by means of which the said valve-
spindle e may be adjusted relatively to the frame o. We provide the other valve-
spindle e with washers p and a bush q indicated by dotted lines. Upon the said
valve-spindle e we form screw-threads capable of being screwed upon which are
nuts by means of which such valve-spindle e may be adjusted relatively to the .
When the valve-spindles e e have been adjusted into the desired position
is secured upon the spindle e with which it is used by the nuts r. The
other.bash qis also secured upon the other valve-spindle e by the nuts r.. .The bushes q
frame o.
one bush

page_text: "
The
are made slightly longer than the bosses o¹ so that when the washers pp are pressed
against the ends of the bushes q by the nuts the bushes 7 will be free to be turned
in the bosses o¹. By means of the arrangements above described the valve-spindles e, e
are enabled to be partially rotated independently of each other while such valve-
spindles e, e are being moved longitudinally by means of the "excentric." We form
a flange m around the slide m upon which the frame is slidden to prevent the
escape of the lubricating material employed to lubricate the frame o and guide plate m.
A further part of our invention relates to apparatus by means of which we turn
the valves of the class before referred to in one direction for the admission of steam
or other fluid to the cylinder and to arrangements of apparatus by which the steam
or other fluid is "cut off" at any desired portion of the "stroke" of the engine by
means of a spring. This part of our invention is illustrated by Figs. 6, 7, 8 and 9
of the drawings hereunto annexed. Fig. 6 is a side view partly in section. Fig 7.an
elevation partly in section. Fig. 8 a plan and Fig. 9 a side elevation. Upon a
shafts hereinafter referred to as the "cam-shaft" s, which is "driven" by means of
gearing" by the crank-shaft of the engine we mount two cams tone only of which
is shown the other being similar thereto one camt operating the valve at one "end"
of the cylinder and the other cam t operating the valve at the other "end". of the
cylinder. As the parts operated by each of the cams above mentioned are similar in
construction and operation to those operated by the other of the said cams we shall
for convenience; only refer to the parts operating one of the valves. u is a framing
which may either be a portion of the engine-framing or may be a framing
independent of the engine and secured to any convenient and suitable support.
cam shaft sis supported by and capable of being revolved in a pedestal u¹
secured to the framing u. Secured to the framing u is a guide upon which we
mount a frame w which frame w is moved upwards by means of the cam t.
Carried
by the frame w and capable of being slidden in guides w¹ formed upon the
frame w is a block a provided with a catch a which at times as will be hereinafter
pointed out, acts upon a projection y₁ on the rod y. The rod y is connected by
suitable rods to a lever z shown in Fig. 1 through one end of which lever one of the
valve spindles e may be moved longitudinally. The lever is prevented from being
moved sideways by the bosses 1ª formed upon a bracket 1 secured to any fixed part
of the engine framework n. The said valve spindle e is provided with a squared
portion e which passes through a square hole formed in the lever. The square hole in
the lever z and the squared portion e¹ of the said valve-spindle e enable the lever z to
turn the said valve-spindle e while such valve spindle e is being traversed
longitudinally. Carried by the frame w and capable of being turned therein is a
short shaft 2 fast upon which is a lever 3 4 is a spring which spring 4 tends to turn
the lever 3 shaft 2 and the lever 5 in the direction indicated by the arrow J. A
part 5 of the lever 5 passes into a slot or recess formed in the block ..
lever 5 is formed with an inclined portion 5b. Upon the cam-shaft s before referred
to we mount an excentric 6 to which is connected one end of a rod 7 the other end
of which is jointed to one end 8" of a lever 8 mounted upon a shaft 9 supported in a
bracket 10 in which it may be turned. If the situation or design of the engine
renders it more convenient the shaft 9 may be driven by means of spur wheels from
the cam-sbafts or by means of bevel wheels from the crank-shaft of the engine and
the excentric 6 be fixed on the shaft 9 and move the rod 13 without the connecting
rod 7 and lever 8 being employed. The bracket 10 is secured to a wall 11 or other
convenient support. The lever 8 is formed with a slot 8b secured in which is a
stud 12 jointed to which is one end of a rod 13 the end of which rod 13 is formed
with a jaw 13" which embraces the lever 5. The jaw 13" is provided with a bowl or
roller 13 against which the lever 5 is forced by the spring 4. To the rod 13 is jointed
one end of a rod 14 which is moved longitudinally by the "governor " of the engine.
As the cam t rotates in the direction indicated by the arrow K the frame w will be
moved in the direction indicated by the arrow L and the catch a¹ arriving against the
projection y will move the rod y in the direction indicated by the arrow L and by
means of the rod aforesaid, lever z and valve-spindle e turn the valve d to admit
z
The

page_text: steam into the cylinder b. A further rotation of the cam t will by means of the
excentric 6 cause the bowl or roller 13 to act against the lever 5 and turn it
against the resistance of the spring 4 and withdraw the catch from the
projection y when the rod y being liberated will by means of a spring be moved
in a direction opposite to that indicated by the arrow L and thereby "cut off" the
steam or other fluid.
To enable the "governor" to "determine" the portion of the "stroke" at which
the "cut off" shall take place we cause the "governor " to move by means of the
rods 14 and 13 the bowl or roller 13b so as to cause such bowl or roller 13 to
act upon the inclined portion 5 of the lever 5 so as to withdraw the catch a¹ from
the projection y earlier or later thereby leaving the valve d to be turned earlier or
later by the spring previously referred to, to "cut off" the steam or other fluid. By
securing the stud 12 in the slot 8h nearer to or farther from the axis of the shaft 9 the
amount of motion imparted to the bowl or roller 13 by the shaft 9 may be regulated
as may be desired.
دو
In order to prevent the springs which close the valves d d from closing such
valves d d too suddenly and to avoid "shock we "govern" the closing of each of
such valves d d by means of a "dash pot" of any suitable kind.
A modification of our invention which we propose to employ in cases where it is
convenient to apply the apparatus about midway between the ends of the cylinder
is illustrated in plan by Fig. 10 and in elevation by Fig. 11 of the drawing hereunto
annexed. In this modification only one cam is required to turn both valves and one
excentric disc or cam acts alternately on the two inclined levers which disengage the
catch pieces and allow the valves to be closed and effect the "cut off." Upon a shaft s
between the valve-boxes we place a cam revolving at the same speed as the
crank-shaft of the engine but in a horizontal plane. Secured to the framework n
of the engine is a plate 17. Upon the plate 17 and capable of being slidden thereon
is a frame 18 such frame 18 being slidden between guides 19 formed upon the
plate 17. Upon the plate 17 and surrounding the frame 18 is a ledge such ledge
preventing the escape of the lubricating material employed to lubricate the surface of
the plate 17 and the frame 18 and guides 19. Within the frame 18 is an opening 18ª
in which the cam t is situate. The cam t when rotating acts against the sides 18"
of the opening 18ª alternately and by so doing causes the frame 18 to be traversed
to and fro between the guides 19. To the frame 18 are fixed catch-pieces 20. One
catch-piece 20 at times engages with a catch-piece 21" fixed upon a rod 21. The rod 21
is jointed to one end of a lever 22 fast upon a short shaft 23 carried by bearings in which
it may be turned such bearings being fixed to the framework n. Fast upon the short
shaft 23 is a lever 24, 25 is a rod one end of which is jointed to the lever 24. The
other end of the rod 25 is jointed to the lever formed with a square hole through which
a square portion el secured to the valve-spindle e may be slidden. The lever z is
prevented from moving sideways by the bosses 1ª of the bracket 1 secured to the
framework n of the engine. The other catch-piece 20 at times engages with a catch-
piece 21 upon another rod 21. As the said rod 21 is connected to one of the valve-
spindles ee by means of apparatus similar to that by means of which the first
mentioned rod 20 is connected to the valve-spindle e to which it is connected it will
not be necessary to further describe the apparatus by means of which the other rod 20
is connected to the valve-spindle e to which it is connected. To the sliding frame 18
are jointed by means of pins 26, levers 5. The end 5ª of one of the levers is
under the end of one rod 21 and the end 5* of the other lever 5 is under the end
of the other rod 21. The ends 5 of the lever 5 are made of an inclined or curved
form so as to project within the "range" of a cam or disc 6 by which the "time"
of the "cut off" is regulated which cam or disc 6 is hereinafter referred to as the
cut off" cam 6. The cut off" cam 6 is rotated by the shaft s. The "cut off"
cam 6 while being rotated is at liberty to be moved longitudinally upon the shaft s
upon which it is mounted by the "governor to which it is connected by means of
the rod 14 in any convenient manner. As the camt rotates the frame 18 will be
traversed first in ono direction and then in an opposite direction. If the camt rotate
«
22

page_text: in the direction indicated by the arrow M the frame 18 will be moved in the
direction indicated by the arrow N and one of the catchpieces 20 acting against the
catch-piece 21ª on one of the rods 21 will draw the said rod 21 also in the direction
indicated by the arrow N'and by means of the said rod 21, lever 22, shaft 23, lever 24
rod 25 and lever z turn the valve-spindle e so as to admit steam to the end A of the
cylinder b. The rotation of the shaft s will cause the cam 6 which is shown in plan
in Fig. 12 to act upon one of the levers 5 so as to turn it in the direction indicated
by the arrow O. The end of the said lever 5 acting against the rod 21 will raise
the catch-piece 21" clear of the catch-piece 20 so as to leave the rod 21 free to be
drawn by a spring acting upon the rod 21, which spring tends to draw the rod 21 in
the direction indicated by the arrow P. The movement of the rod 21 in the direction
indicated by the arrow P will cause the valve-spindle e to be turned so as to "cut off"
the steam or other fluid from the end A of the cylinder b. A further rotation of
the "cut off" cam will carry such "cut off" cam 6 clear of the end 5° of the lever 5
thereby allowing the rod 21 to pass into such position that the catch-piece 20
will again act against the catch-piece 21 to draw the rod 21 in the direction
indicated by the arrow N. We have in the preceding description referred to the
apparatus operating the valve at the end A of the cylinder band to corresponding
parts operating the valve at the end B of the cylinder b we have affixed the same
letters of reference as we have affixed to the corresponding parts operating the valve
at the end A of the cylinder b. The arrows at the end B of the cylinder b it will be
observed point in directions opposite to those of the corresponding arrows at the end A
of the cylinder b. Further description of the parts operating the valve at the end B
of the cylinder b will not be necessary.
If by the action of the "governor" the disc or cam 6 be moved in an upward
direction upon the shaft s the disc or cam 6 will by acting against a part of the
lever 5 situate nearer to the axis of the shaft s raise the catch-piece 21ª clear of the
catch-piece 20 earlier in the "stroke" of the engine. According as the disc or cam 6
is raised or lowered by the "governor "steam or other fluid will be "cut off" earlier
or later in the "stroke" of the engine.
The arrangements of apparatus herein before described in reference to
Figs. 6. 7. 8. 9. 10 and 11 of the drawings hereunto annexed are also applicable for
operating "Corliss valves" and flat rotating or circular slide-valves:
We would have it understood that we do not confine ourselves to the use of our
invention precisely in the manner hereinbefore described as many of the details of our
invention may be modified without departure from the principles of our invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
:-
1. The hereinbefore described arrangements whereby the piston-valve at each end
of the cylinder is connected to the piston-valve at the other end of the cylinder so
as to be capable of being turned independently of such piston-valve while at the
same time both of such piston-valves are receiving rectilinear motion from the same
excentric, all substantially as herein before described in reference to Figs. 1. 2. 3. 4
and 5 of the drawings hereunto annexed.
2. The hereinbefore described arrangement of apparatus for turning the piston-
valve at each end of the cylinder independently of the piston-valve at the other end
of the cylinder or for operating the "Corliss valve" or flat or circular slide-valve at
each end of the cylinder independently of the "Corliss valve" or flat or circular slide-
valve at the other end of the cylinder which arrangement of apparatus consists in
the can t, frame w, rod y, guide v, block a, levers 3 and 5, spring 4, excentric 6 or an
equivalent therefor and the rod 7, lever 8 rod 13 and bowl or roller 13b all constructed,
arranged and operating for the purposes and substantially in the manner hereinbefore
described in reference to and indicated in and by Figs. 6, 7, 8 and 9 of the drawings
hereunto annexed.
3. The hereinbefore described arrangement of apparatus for turning the piston-valve

page_text: 22
at each end of the cylinder independently of the piston-valve at the other end of
the cylinder or for operating the "Corliss valve or flat or circular slide-valve at each
end of the cylinder independently of the "Corliss valve" or flat or circular slide-valve
at the other end of the cylinder which arrangement of apparatus consists in the
cam t, frame 18, levers 5 catch-pieces 20, catch pieces 21", rod 21, cam or disc 6 and
rod 14 all constructed, arranged and operating for the purposes and substantially in
the manner herein before described in reference to and indicated in and by Figs. 10
and 11 of the drawings hereunto annexed.
4. The combination substantially as hereinbefore described in reference to and
indicated in and by Figs. 6. 7. 8. 9. 10 and 11 of the drawings hereunto annexed, of
the excentric-disc or :: cut off" cam 6 and levers 5 of inclined form, the disc or cam 6
either acting directly on the levers 5 substantially as in the arrangement illustrated by
Figs. 10 and 11 of the drawings hereunto annexed or through suitable levers and
bowls or rollers 13 substantially as in the arrangement illustrated by Figs. 6. 7. 8
and 9 of the said drawings, the inclined form of the levers.5 causing the "cut off"
to take place earlier or later as the disc or cam 6 or bowl or rollers 13" is or are raised
or lowered by the " governor."
1
ր A
11 1000
W. T. CHEETHAM,
Manchester,
Agent to the Applicants.