Improvements in Compound_Rotary Engines, applicable also as Pumps.
Year: 1890

page_text: Date of Application, 25th Sept., 1890
Complete Specification Left, 25th June, 1891-Accepted, 15th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Compound_Rotary Engines, applicable also as
Pumps.
I, HENRY THOMAS LIVERSEDGE of Highbury Villiers Road Southsea Hamp-
shire Engineer do hereby declare the nature of this invention to be as follows:-
A compound rotary engine constructed according to this invention, consists of
two cylinders an outer large cylinder and inner small cylinder. The inner cylinder
is placed inside and against outer cylinder, in the centre of outer cylinder and inside
inner cylinder there is a fixed centre around which fixed centre the pistons revolve.
The inner cylinder is carried by two discs one at each end, on the inside faces of
the discs through their centre line and through the inner cylinder there is cut a slot
into which the pistons are fitted to slide. The motive fluid is admitted into and
from inner cylinder to outer cylinder by a projection on one of the discs-which
acts as a rotary valve. When the pistons are forced around they carry the discs
around conveying the motion to a shaft on which one of the discs is mounted.
In a compound rotary engine according to this invention, a motive fluid cylinder
has within it a smaller motive fluid cylinder, mounted or carried by discs, one at
either end of outer cylinder.
I will call these cylinders for distinction outer and inner cylinders.
The inner cylinder is placed with its exterior surface in rubbing contact with the
interior surface of outer cylinder.
The discs are larger in diameter than the diameter of outer cylinder by the
distance the centre of inner cylinder is placed away from the centre of outer
cylinder.
The ends of the outer cylinder have suitable recesses added to take the discs.
The outer cylinder is stationary, the inner cylinder with its discs are enclosed in
the outer cylinder by covers or ends.
The inner cylinder and the discs revolve together, inside the outer cylinder, the
point of contact between inner and outer cylinders being maintained by the discs
which carry the inner cylinder.
The shaft to be rotated passes through a gland in cylinder cover at one end of
outer cylinder, on this shaft is mounted one of the discs, at the other end of outer
cylinder the disc has a projection fitting into a recess in the cylinder cover, in this
projection there are fluid ports or passages which govern the admission of motive
fluid into the inner cylinder and from the inner to the outer cylinder.
Inside the inner cylinder there is a round fixed centre which has its exterior
surface in rubbing contact with the interior surface of inner cylinder, the point of
contact being on the same centre line but opposite to the point of contact between
inner and outer cylinders.
At one end of the fixed centre there is a short bearing which fits into a hole in
the centre of disc, at the other end of fixed centre there is a longer bearing which
passes through the disc and its projection hereinbefore mentioned and through the
cylinder cover where it is secured in position, a cap fitted over the end of the
bearing is bolted to the cover. <
The fixed centre is in the centre of outer cylinder.
Through the inner cylinder and down the sides of the inner faces of discs there
s cut a slot or channel into which slot or channel there are fitted two pistons,
these two pistons one on either side of fixed centre, will work round the fixed
centre with one edge in rubbing contact with the interior surface of outer cylinder
and the opposite edge in rubbing contact with the fixed centre.
As the centre of inner cylinder is placed away from the centre of outer cylinder,
17 .

page_text: the pistons are alternately in and out of inner cylinder when the discs and inner
cylinder revolve.
The faces of the pistons which are in contact with the interior surface of outer
cylinder and the surface of the fixed centre are kept to their work by the action of
springs and the motive fluid, each piston being made in parts to admit of expansion
and contraction.
As hereinbefore mentioned the admission of the motive fluid to the inner cylinder
is governed by the ports or passages in the projection on one of the discs, there
are two ports or passages, one on either side of centre line through pistons, and
leading from the surface of projection into inner cylinder.
On the outer cylinder cover there are two ports or passages placed one of them
on each side of centre line passing through centres of outer and inner cylinders, as
the disc with its projection revolves these ports or passages are alternately open
to each other.
The two ports or passages in outer cylinder cover are connected by passages or
conduits with a flat valve face having three ports the centre port being connected
by a pipe for the admission of motive fluid, opposite the flat valve face and at a
suitable distance away there is another and similar flat valve face with three ports
the centre port being connected by a pipe to the exhaust, the end ports communi-
cate with the interior of the outer cylinder by pipes or passages on either side of
the point of contact between the inner and outer cylinders.
Two D valves are used placed back to back and working between the flat valve
faces, they will cover two ports and as they are moved backwards or forwards so
each of the end ports are common to the valve box.
The D valves are connected to one spindle and are moved together.
The motive fluid passes by a pipe into centre port of lower valve face into the
D valve, through the covered port by passage into projection, into small cylinder
there forcing the piston around through the disc and projection by passages and
ports into valve box through the open end port, through the open end port on
opposite flat valve face and into interior of outer cylinder, there forcing the piston
around until it passes the port on the other side of outer cylinder then by passing
through the covered port into the D valve and through centre port into exhaust.
By moving the D valves so as to uncover the covered ports and covering the
uncovered ports, the course of the motive fluid is reversed as is the direction of the
revolution of the engine.
It will be obvious that by rotating the discs and inner cylinder of a compound
rotary engine constructed according to this invention as above set forth it may be
used as a pump, the flat valve faces and D valves being dispensed with.
Dated this 24th day of September 1890.
HENRY THOMAS LIVERSEDGE.
COMPLETE SPECIFICATION.
Improvements in Compound_Rotary Engines, applicable also as
Pumps.
HENRY THOMAs Liversedge, of Highbury, Villiers Road, Southsea, in the
County of Hampshire 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 :-
This invention relates to improvements in compound rotary engines, applicable
also as pumps.
In a compound rotary engine according to this invention a motive fluid cylinder
has within it a smaller motive fluid cylinder mounted or carried by discs one at either
end of outer cylinder.
I will call these cylinders for distinction outer and inner cylinders.

page_text: The inner cylinder is placed with its exterior surface in rubbing contace WIN
interior surface of outer cylinder.
At the ends of the outer cylinder there are recesses or disc chambers in which
the discs fit and work.
These recesses or disc chambers are placed eccentrically to the outer cylinder.
Lines drawn through the centre of outer cylinder and through the centres of disc
chambers at each end of outer cylinder are parallel.
The outer cylinder is stationary. The inner cylinder with its discs are enclosed
in the outer cylinder and disc chambers by covers.
The inner cylinder and the discs revolve together. The point of contact between
outer and inner cylinder is maintained by the discs which carry the inner
cylinder.
The shaft to be rotated passes through a gland in one cover of disc chamber, at
end of outer cylinder, on this shaft is mounted, or made in a piece with, one of the
discs. The disc working in the chamber at the other or opposite end of outer cylinder
is mounted on or made in a piece with, the projection or rotary valve, which fits
into and works in a recess in a casing forming part of the cover of disc chamber.
In this, projection or rotary valve, there are fluid ports or passages which
govern the admission of motive fluid into the inner cylinder and from the inner to
the outer cylinder.
Inside the inner cylinder there is a round fixed centre which has its exterior
surface in rubbing contact with the interior surface of inner cylinder. At each end
of this fixed centre there are guide bearings, one, of which, fits into a suitably
provided recess in the centre of one of the discs, the other, passes through the
centre of remaining disc and through the centre of, projection or rotary valve, and
through the wall of the rotary valve recess in the casing forming part of disc
chamber cover, where it is secured in position by a key, a cap fitting over the end
of the bearing and key is bolted to the casing. The fixed centre is in the centre of
the outer cylinder. The guide bearings are eccentric to the fixed centre. Lines
drawn through the centre of fixed centre and through the centres of guide bearings
are parallel. Through the inner cylinder and down the inner or opposite faces of
the discs, there are cut slots or channels, into which slots or channels, there are
fitted two pistons. These two pistons, one on either side of fixed centre, will work
round the fixed centre with one of their edges in rubbing contact with the interior
surface of outer cylinder and the opposite edges in rubbing contact with the fixed
centre and as the centre of inner cylinder is placed away from the centre of outer
cylinder, the pistons are alternately in and out of inner cylinder when, the discs and
inner cylinder revolve.
The pistons are made in parts to admit of the edges, in rubbing contact with the
fixed centre and the interior surface of outer cylinder, following those surfaces
as they revolve, the contact being maintained by the action of springs, the motive
fluid and centrifugal force. In the face of the rotary valve there are four ports or
passages for motive fluid, placed two on either side of centre line passing through
piston slots in disc, they communicate respectively with the four ports in the face of
the disc, opening into the inner cylinder, placed two on each side of piston slots.
In the rotary valve recess in the casing forming part of the disc chamber cover,
there are two ports or passages which, are connected with the reversing valves.
These ports are divided by a line at right angles to that passing through centres of
disc chamber and outer cylinder, when the pistons are on this line the ports in the
The width of the
rotary valve are closed to the ports in the rotary valve recess.
ports in the rotary valve are arranged so that motive fluid may not be admitted
until, the corresponding port in the face of the disc, is open with the port, of the
ports formed in the face of the fixed centre, which is on the driving side of piston.
The ports or passages connecting the ports in rotary valve recess, with the
lower reversing valve, communicate with the end ports of a three ported valve
seating respectively, the centre port of the seating communicates with the pipe or
conduit for admitting motive fluid. The upper reversing valve seating is placed

page_text: immediately over the lower seating in the same box, the end ports of which are
connected by pipes or conduits with each side of the outer cylinder, near the point
of contact with the inner cylinder. Between the three ported valve seatings are
placed back to back with springs between, two D valves, connected to and operated
by one spindle.
The centre port of upper valve seating is in communication with a pipe or
conduit for conveying spent motive fluid away. The D valves are kept against
their seatings by the action of springs and the motive fluid. Specially formed
fluid tight packing is fitted between the disc chamber and fixed centre ends and
the faces of the discs.
The reversing valves may be dispensed with when it is required to run the
engine in one direction only or use it as a pump, communications being provided
direct to and from rotary valve casing and outer cylinder.
Referring to the accompanying two sheets of illustrative drawings,
Fig. 1. is a plan. Fig. 2 is a sectional elevation. Fig. 3 is an end view, with
dotted line section, shewing ports and passages between reversing valves and outer
or low pressure cylinder, with disc chamber cover and disc removed.
Fig. 4 is an end view of the opposite disc chamber cover, with dotted line
section, shewing ports, passages and reversing valves in, the casing forming part of
the disc chamber cover.
Fig. 5 is an end view of one half the packing pieces between the faces of the discs
and disc chamber ends.
Fig. 6 is an end view of the other half.
Fig. 7 is a section through A. B. of Fig. 5.
Fig. 8 is a section through A. B. of Fig. 6.
Fig. 9 is a side view of Figs. 5 and 6 when together.
Fig. 10 is an end view of one half of the packing pieces at ends of fixed centre
where the motive fluid ports are formed, shewing ports and slots for dividing piece.
Fig. 11 is an end view of the other half similarly fitted.
Fig. 12 is a section through A. B. of Fig. 10.
Fig. 13 is a section through A. B. of Fig. 11.
Figs. 10 and 11 are shewn together at ends of fixed centre, Fig. 15.
Fig. 14 is a view of the dividing piece fitting into slot shewn in Figs. 10
and 11.
Fig. 15 is a side view of fixed centre shewing packing pieces at ends, ports or
passages for motive fluid and guide bearings.
Fig. 16 is an end view of fixed centre with side packing removed shewing, end
ports or passages for motive fluid and end view of packing strip.
Fig. 17 is an end view of disc shewing, slots in which the pistons work or
operate, the recess in the face of the dise for, mounting and securing inner or high
pressure cylinder to disc, ports for motive fluid in the face of the disc, hole in
centre through which passes the longer guide bearing of fixed centre.
Fig. 18 is a side view of disc and rotary valve shewing, slot for piston, recess for
inner cylinder, in disc, and ports or passages in the rotary valve for, motive fluid,
with dotted line section of passages from the ports in valve face to the ports in face
of disc for, motive fluid, and dotted line section of hole through which guide bearing
of fixed centre passes.
Fig. 19 is an end view of piston.
Fig. 20 is a section through a. b. of Fig. 19 shewing, the method of forming and
fitting the spring.
Fig. 21 is a top view of piston.
Fig. 22 is a section of reversing valves shewing, manner of fitting springs.
In Fig. 1. 1 is the outer or low pressure cylinder, 1ª is the stand plate of
engine, 2 and 3 are recesses or disc chambers, at either end of, but eccentric to, the
outer cylinder 1. 4 and 5 are covers on disc chambers 2 and 3. 6 is a gland in
cover 4 through which passes the shaft 7. 8 and 9 are pipes or conduits connecting
reversing valves in casing, to cylinder 1. 10 is a casing forming part of disc

page_text: :
chamber cover 5. 11 is a flange on casing 10 to which is jointed the cover or
door 12. 13 is a pipe or conduit for admission of motive fluid to the reversing
valves. 14. 15. 16 are ports in the dotted line plan of upper reversing valve
seating. 17 is a pipe or conduit for conveying away spent motive fluid. 18 is
a gland in casing 10. 19 is a bracket to which the reversing lever 20 is
pivotted at 21. In Fig. 2 1 1: 2: 3: 4: 5: 6: 7: 9: 10: 11:12 13: 17
are as described in Fig. 1. 22 and 23 are discs fitting into and working in disc
chambers 2 and 3. 24 is a recess in casing 10 forming part of the cover 5, into
which fits and works the rotary valve 24ª. The disc 22 is mounted on or inade in
a piece with the shaft 7. The disc 23 is mounted on or made in a piece with the
rotary valve 24º. 25 and 26 are specially formed packing pieces between the disc
chamber ends and the faces of the discs. 27 is the inner or high pressure cylinder
and is mounted between the discs 22 and 23 by fitting into recesses provided in the
faces of the discs 22 and 23 and secured with screws as shewn at 28 28": 28° 28°,
as will be understood from the drawings. 29 is a fixed centre, fixed in position so
as to be concentric with the outer cylinder 1. and is so maintained by the guide
bearings 29 and 29. 29ª fits into a suitably provided bearing in the centre of
the disc 22, the disc 22 will work or revolve round the guide bearing 29", which is
at one end of the fixed centre 29. At the other end there is a longer guile
bearing 29, which passes loosely through the centre of the disc 23 and the rotary
valve 24 and tightly through the end wall of the recess 24, where it is secured in
position by the key 29. The disc 23 and rotary valve 24" revolve round the guide
bearing 29b, but need not touch it. The guide bearings 29" and 29, of the fixed
centre 29 are placed or formed eccentrically to that portion of fixed centre which is
concentric with the outer cylinder 1. 29 is a cover fitting over end of guide
bearing 29 and key 29. The fixed centre 29 is mounted on or made in a piece with
the guide bearings 29ª: 29". 30 and 31 are specially formed packing pieces
between the ends of the fixed centre and the faces of the discs. 32 is a packing
strip along the length of the fixed centre 29 and is kept against the interior
surface of inner cylinder by the action of motive fluid and springs, 33 and 33".
34 is a packing strip in outer cylinder 1. and is kept against the exterior surface
of inner cylinder by the action of springs, 35 and 35 and of the motive fluid.
A line drawn through centres of disc-chamber and outer cylinder would pass
through the centre of contact of the packing strips 32 and 34. The point of
contact of the packing strip 32 is with the top interior surface of inner cylinder 27,
and the point of contact of the packing strip 34 is with the bottom exterior
surface of inner cylinder 27. 36 is a division in the casing 10 for admission of
motive fluid from 13 to the reversing valve. 37 is the reversing valve compartment
in casing 10. 38 is a division in casing 10 connecting pipe or conduit 17 with the
reversing valve. In Fig. 3. 1 1: 8: 9: 17: 18: 19: 20: 21: 27: 28: 28":
29: 29: 34: 35 are as described in Figs. 1 and 2. 39 and 40 are pistons which
work in slots down the faces of discs 22 and 23 of Fig. 2. and through the wall of
the inner cylinder. a and b, are ports or passages for motive fluid through the end
packing piece and fixed centre 29. c. d. e. . are ports or passages for motive fluid
in the face of the disc. 41. 42ª 42. 43. 43 and 44 are ports or passages for
motive fluid, connected to the upper reversing valve, by pipes or conduits 8 and 9.
45 is the reversing valve spindle passing through the gland 18, is connected at one
end to the reversing valves and joined at the other end to the lever 20 at 46. In
Fig. 4. 5 8 9 10 11 14 15 16 17 18 19 20 21 24: 29: 36:
45: 46 are as described in Figs. 1 : 2 and 3. 47 48 51 and 52 are ports or
passages connecting the ports in rotary valve casing with the reversing valve 49, in
the reversing valve compartment 37, of the casing 10, forming part of disc chamber
14 54 16 and 55 are ports or passages connecting the reversing
valve 53 with the pipes or conduits 8 and 9. 15 and 38 are ports or passages
connecting the reversing valve 53, in compartment 37, of casing 10, with the pipe
or conduit 17,
cover 5.

page_text: In Fig. 5 the projections 51 are made to fit accurately in the opposite channels pro-
vided at 52 in Fig. 6. Fig. 5 is secured to the disc chamber end by screws, the pro-
jections 53 of Fig. 6 are fitted into the channels 54 of Fig. 5. When Figs. 5 and 6 are
placed together the faces 57 and 58 are in contact and the channels 55 are common
to both Fig. 5 and 6. Filling pieces are accurately fitted into the channels 55 as
at 56 in Fig. 9. The projections 51 and 52 of Figs. 5 and 6, are made narrower
than the width of the pistons 39 and 40 of Fig. 3. When the disc chamber is not
large enough to allow the projections, 51 and 53 of Figs. 5 and 6 respectively,
being made all round the same, they are modified as shewn in the sections Figs. 7
and 8. The result of this arrangement is that, when the packing piece Fig. 6 is
pressed outwards by the motive fluid acting on the ends of the projections 52
Fig. 6, the flow of the motive fluid in the openings, past the piston is prevented
by one edge of the piston always overlapping the space made by the moveable half
being pressed out. The filling pieces serve to assist in locking the Figs. 5 and 6
together, they also reduce the area of the faces 57 and 58 and ease the pressure
between the faces 57 and 58 due to leakage of motive fluid past the sides and
bottoms of projections, by allowing the motive fluid to leak on to the outer face
and between the disc, the area of the face of the moveable piece next the disc
being eased away to admit of so balancing the pressure due to leakage of motive
fluid past the projections, sufficient surface being left on the moveable piece to
make a continuous fluid tight contact with disc face around the projections; by
these means the moveable packing piece is pressed outwards by the action of the
motive fluid on the ends of the projections and if there is a leakage of motive
fluid between the faces of the packing pieces there will be some pressure outwards
due to that. Figs. 10 and 11 are the same as Figs. 5 and 6 excepting that the
projections are on the outside edge and there are no filling pieces and that there
is a dividing piece provided at the end which is fitted with ports or passages for
motive fluid. The dividing piece Fig. 14 fits into the slot G, of Figs. 10 and 11
and serves to divide the ports or passages a and b except a small leakage by
packing strip at G₁ of Fig. 10. Fig. 10 is secured to the end of fixed centre by
screws and keys in the guide bearings. The pistons are made in pieces or parts
as shewn in Figs. 19: 20 and 21. The centre 1' is made in one piece and is
accurately fitted between the fixed centre and the interior surface of the outer
cylinder, the edges being rounded to admit of its revolving round the fixed centre.
The parts 21 4: 31 and 5' are divided to admit of their following the surface of
the fixed centre and the outer cylinder when revolving. The narrow parts 4 and 5
are against the fixed centre. Centrifugal force and the action of the motive fluid
will keep the parts 2 and 3 pressing against the outer cylinder. the action of the
springs and the motive fluid will keep the parts 4 and 5 pressing against the face
of fixed centre. The spring S is so formed that after one half the compression the
feet of the spring a Fig. 20 are assisted by the parts c and d Fig. 20, taking a
bearing against the spring, this gives the spring more power if at high speeds the
centrifugal force should be greater than the action of the motive fluid in pressing
the parts 4¹ and 5' Fig. 20 against the fixed centre. In Figs. 17 and 18. 39
and 40", are slots for pistons to work in as hereinbefore described 27ª is a recess for
mounting the inner or high pressure cylinder between the discs. c. d. e. f are ports
or passages in the face of the disc for motive fluid, a' and are ports in the rotary
valve 24 connected by passages with the ports d and fin face of disc, the ports
connecting cand e are not shewn in the drawings. The circumference of the
rotary valve 24" is divided into four parts, the plain surface between d' and f¹
Fig. 18 is equal to one fourth, and similarly on the other side of the valve not
shewn in the drawings, the surface between the ports cand e¹ is equal to one
fourth the circumference and the distance between the outer edges of the
ports and on the one side of centre line through piston slots and the
distance between the outer edges of the ports e¹ and f¹ on the other side of centre
line through piston slots is respectively equal to one fourth the circumference of

page_text: valve, the width of the ports c¹; d'; f¹; e¹ is governed by the ports in the face of
the disc and in the fixed centre so that motive fluid is admitted only to the driving
side of the pistons. The operation of the engine as a moter is as follows:-
Supposing the pistons to be in the position shewn at Fig. 3 and that the direction
of revolution be with the arrow, motive fluid is admitted by the pipe or conduit 13
into the division 36, the reversing lever 20 is pressed towards the engine. Motive
fluid then passes from 36 by the port 50 into the lower reversing valve 49 then by
ports or passages 51 and 52 into rotary valve recess 24, in casing 10, then by
the port or passage c¹ and c in rotary valve 24ª and disc 23 into inner cylinder,
partly direct and partly through the ports and passages a and a' in fixed
centre 29, the port el is not shewn in the drawings, the piston 40 is forced round
until the port d in disc face 23 is past the end port b in fixed centre 29, when
motive fluid port d¹ will open to the port 52 in rotary valve recess and motive fluid
will then be admitted into the inner cylinder 27 through both ports c¹ and d¹ in
rotary valve 24 and ports c and d in face of disc 23 the piston 40 being forced
round until in the position of piston 39 when the ports c¹ and d' will as the revolution
continues be opened to the port 47 in the rotary valve recess 24, of casing 10, and
the motive fluid will then pass from the inner cylinder 27 by the ports or
passages c and d in face of disc 23 and ports c¹ and d in rotary valve 24", ports or
passages 47 and 48 into reversing valve compartment 37 of the casing 10 then by
ports or passages 14 and 54 into pipe or conduit 8, into ports or passages 41: 42
and 42ª and into outer cylinder 1, forcing the piston round until it passes the ports
or passages 43" and 43 then by passage 44 into the pipe or conduit 9, by the pipe
or conduit 9 into the upper reversing valve 53 by the ports or passages 55 and 16,
then by the ports or passages 15 and 38 into the pipe or conduit 17 and away into
the atmosphere or condenser. If the discs and inner cylinder be revolved by means
of the shaft the engine may be used as a pump the reversing valves are dispensed
with a simple or plain casing enclosing the rotary valve having a joint at each side
communicating with the ports or passages--a suction valve being fitted to one
side and delivery valve to the other and similarly to the outer cylinder in place of
the pipes or conduits 8 and 9, or the fluid may be made to follow the direction of
the motive fluid from the high to the low pressure cylinder.
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. In a compound rotary engine the use of the discs fitting and working in disc
chambers arranged eccentrically with and at each end of the outer or low pressure
cylinder in combination with and carrying, the shaft, the inner or high pressure
cylinder and the rotary valve, provided with slots or channels, down their inner
and opposite faces, passing through the walls of inner or high pressure cylinder in
which slots or channels the pistons operate or work substantially as described and
shewn in Figs. 1: 23 17 and 18 of the drawings.
2. In a compound rotary engine the use of the special form of fixed centre
provided with ports or passages for motive fluid at the end next the disc which
carries the rotary valve such end ports or passages communicating with ports or
passages along the length of the fixed centre on each side of its point of contact
with the inner cylinder in combination with the guide bearings placed eccentrically
to such centre, secured and maintained in position substantially as described and
shewn in Figs. 2: 3: 15 and 16 of the drawings.
3. In a compound rotary engine the use of the special form of piston consisting
of a plain centre plate and a divided plate on either side of plain plate in combi-
nation with the special form of spring fitted between divided plates, operating
in slots or channels formed down the inner and opposite faces of the discs and
through the walls of inner or high pressure cylinder and around the fixed
centre substantially as described and shewn in Figs. 3: 19: 20 and 21 of the
drawings.

page_text: 4. In compound rotary engines the use of the special form of flexible packing
fitted between the discs and ends of disc chambers substantially as described and
shewn in Figs. 5: 6: 7: 8 and 9 of the drawings.
5. In compound rotary engines the use of the special form of flexible packing
fitted to the ends of fixed centre substantially as described and shewn in Figs. 10,
11, 12, 13, 14 and 15 of the drawings.
6. Compound rotary engines constructed arranged and operating substantially as
described with reference to Figs. 1 to 22 respectively of the drawings.
Dated this 24th day of June 1891.
HENRY T. LIVERSEDGE.