US453613A

US453613A - Rotary engine

Info

Publication number: US453613A
Authority: US
Publication date: 1891-06-09
Anticipated expiration: 1908-06-09

Description

sheets-Sheet 1."

Patented June 9,1891.

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(No Model.)

S. G. BROSIUS.

ROTARY ENGINE.

4 Sheets-Sheet 2.

(No Model.)

S. G. BROSIUS.

ROTARY ENGINE.

No. 453,613. Patented June 9,1891.

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4 Sheets-Sheet 3.

(No Model.)

S. G. BROSIUS.

ROTARY ENGINE.

No. 453.613A

Patented June 9,1891.

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(No Model.) 4 Sheets-Sheet 4.

S. G. BROSIUS.

ROTARY ENGINE.

No. 453,613. Patented June 9,1891.

i; ATTO/WV? 'raTns PATENT GFFICE.

SAMUEL GLENVILLE BROSIUS, OF SAVANNAH, GEORGIA.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 453,613, dated June 9, 1891.

Application tiled March 28, 1891. Serial No. 386,872. (No model.)

T LZ-Z whom t may concern,.-

Be it known that l, SAMUEL GLENvILLn BROSIUS, of Savannah, in the county of Chatham and State of Georgia, have invented a new and useful Improvement in Rotary Engines, of which the following, taken in connection with the accompanying drawings, is a specication.

The invention has the following objects:

1o first, to produce a rotary engine of the least possible friction; second, to produce a rotary engine having a steam-tight packing; third,

to construct an engine in such a manner that no part shall bind or cramp, and so that the pistons will be at rest with regard to the rotating cylinder when under pressure, and to admit steam, so as to avoid binding the cylinder or pistons in any posit-ion and to avoid all centrifugal and centripetal friction and any packing causing undue friction; fourth, to admit steam simultaneously to the cylinder or* cylinders, so as to avoid all binding or cramping; fifth, to oseillate or rotate the pistons when the same are not under steampressure, thus avoiding friction which would be otherwise encountered; sixth, to construct the cam or cams which oscillate or rotate the pistons with the least possible throw, so as to avoid jar, and also to construct said cam or cams with periods of restand periods of throw; (during the periods of throw the pistons are balanced and oscillate or rotate, traveiin g with the rotating cylinder, and d uring the periods of rest they propel and revolve the rotating cylinder;) seventh, to construct the engine in such a manner that the pistons after passing the abutments oscillate, thereby closing the cylinders and acting as piston-abutments, and being at rest with said cylinders during the period they are traveling and rotating with said cylinders around the axes of said cylinders to the point of the exhaust, where oseillations of said pistons again occur to pass said abutments, the said oscillations taking place during theA time they are not under steam-pressure or after exhaust or when the steam is on both sides of the piston, so that the pistons will be balanced; (while it has been stated that the oscillations are not under 5o pressure, yet they maybe, if found advisable;)

eighth, to journal the pistons so that the periods of oscillation and periods of rest may be controlled by a cam or some mechanical equivalent; ninth, to construct and connectthe pistons so that they will be balanced against centrifugal force under oscillation; tenth, to construct the pistons with wings, which will balance each other against centrifugal force; eleventh, to propel the shaft by pressure on the piston, said power being communicated directly through the cylinder to the shaft, to which it is securely attached; twelfth, to obtain an abutment with curves so constructed to avoid the edges of the oscillating piston and reduce the waste-steam area to a minimum; thirteenth, to oscillate the pistons by levers operated by cams; fourteenth, to completely balance the end pressure on the pistons by placing two pistons on one shaft; fifteenth, to balance the levers which control the oscillations of the pistons against centrifugal force; sixteenth, to connect the cylinders so that steam admitted into one may readily pass through to the other; seventeenth, to connect the cylinders so that the steam admitted into one passes to the other by suitable passages, thus avoiding friction from end pressure; eighteenth, to obtain a simple and effective packing between the rotating cylinder and stationary disk; nineteenth, to obtain a perfectly-balanced engine in all its parts, which will not be jammed or cramped by steam-pressure, centrifugal or centripetal force, centrifugal packing, and do away with packing around the hub and all sliding friction, or any friction caused by any other than ordinary packing, and to obtain a practical and simple construction. These and other objects are accomplished by the engine hereinafter described.

My invention consists of certain broad and novel features of construction hereinafter described, and particularlypointed out in the claims.

In the accompanying drawings, which illustrate my invention, Figure l is an end elevation of the engine, showing the location of steam and exhaust chests. The cylinders, pistons, and abutments are shown in broken lines. Fig. 2 is a cross-section of the engine on line A3 A3 of Fig. 1. Fig. 3 is a cross-section of the engine on line A4 Ai of Fig. 2. Fig. a is a cross-section of the engine on the line A5 A? of Fig. 2. Fig. 5 is an elevation IOO of the pistens. Fig. 6 is an end view of the pistons. Fig. 7 is an end view of the pistons, a cross-section being taken on line A7 A7 of Fig. 5. Figs. Sand 9 are respectively eud and side elevations of the cam-blocks. Figs. 10 and 11 are respectively end and side elevations of the lever. Fig. 12 is a side elevation, part in cross-section, of .the cam. Fig. 13 is a cross-section of the cam on the line A6 A6 of Fig. 12. Fig. 14 is an end view of the journal-box. Fig. 15 is a side elevation,part in cross-section, on the line AS A8 of Fig. 14.

Figs. 16, 17, and 18 are respectively the plan,

side, and end elevations of the packing-strips in the piston-seats. Fig. 19 is an end elevation, part in cross-section on the line B5 B5 of Fig. 20. Fig. 2O is a cross-section on the line B4 B4 of Fig. 19. Fig. 2l is a cross-section on the line B8 B2 of Fig. 22, showing the abutment in position on the head. Fig. 22 is an end elevation of the head, showing the location of the abutment and the steam and exhaust ports.

Like letters of reference refer to like parts throughout the several views of the drawings.

Vithin an outer casing G, to which are attached the heads H H, secured to a baseplate W, there are arranged rotating cylinders C, with their pistons A AB B. Said pistons by their crank-shafts are controlled by the cam or cams. Said cams may be attached to the outer casing G.

The cylinders C are attached to the shaft N and drive it, and are constructed so as to have annular cavities C4, which are formed by rings C7 C8 and disk C, and piston-seats C, with their ilanges h, which complete the circles of the rings C7 C8, allowing complete ring-packin g to be used between tht` packingplate H4 of the casing-heads H H and said rings C7 C2, as shown in Figs. 2, 3, 19, and 20. The shaftrN is mounted in journal-boxes K, whichma-y be attached to casing-heads H and H. The said piston-seats C6 contain packingstrips P, which have projections p5 in their backs, forming the recess p to receive and hold in position the springs p4. The packing- Y'stripsV also'ha've the oblong hole 152 lengthwise, i

through which the pins p2 pass. Said pins extend through the holes and engage the cylinder in such a manner as to hold said packing in place when the wings A2 are not in contact with them, as shown in Figs. 3 and 16 to 20, inclusive. Said packing-strips are also beveled on the contact side, so as to allow the edges of the piston-wings A2 to push said packing-strips back in place should they protrude too far. The cylinders are connected by the steamways Y', having the channel Y, which is the passage between the cavities C4 in the cylinders C, through which the steam freely passes from one cylinder to the other, which thus equalizes the pressure in bot-h cavities simultaneously and admits of the use of one steam-port and one exhaustport for each cylinder. The pressure on the outer ring C7 is neutralized bythe pressure on the inner ring CS, and the end pressure on the two disks C9 counteract each other in like manner, as also does Vthe pressure on the 7o disks L of the pistons A A on the opposite end of the pistoirshaft a, thereby perfectly balancing the cylinder and all parts under pressure during its revolutions.

The cylinders C are provided with the piston-seat heads c, which are placed centrally with the piston-seat C6 and contain the journal-boxes c2, in which the journals of the pis.- ton-shaft a oscillate. These heads may be integral with said cylinder; but it will facili- 8o tate construction and repairscto make them separate and securely attached thereto.

The pistons A and-A are constructed with wings A2 and disk L. One piston is attached to each end of the crank-shaft a, which has the crank c2. The wings A2 balance each other against centrifugal force and are cut to the curves L2 L2, respectively, which correspond to the curves of the outer and inner periphery of-the rings C7 C8, respectively, of '9o cylinder C, as shown in Figs. 3, 5, 6, and 7.

The pistons are provided with packingrings P2 in disks L and the packing-strips P4 in the ends of the wings A2. Said packing rings and strips respectively pack the disk 2 L in the piston-seat C6 and the ends of the wings A2 against the packing-plate H4 of the casing-heads H H.

The pistons B B are identical in construction and operation to pistons A A. Piston- Ioo shaft b, with its crank-shaft b2, is also identical with piston-shaft c and its crank d2.

The casing-headslfll-l are providedwith abutments I, which protrude intorthe cavities' C4, and are packed against the rings C7 C8 and 105 journal-box extends on each side of it to enable the engine to be shortened by such a distance as the journal-boxes extend within the casing-heads H H. As a given length of journal is required for a given-sized shaft, it

will be readily seen how this operates in makr 2o ing the engine more compact. The said heads vH H are also provided with the pack-ingplates H4. The faces of the said packingplates may be made to the curve formed by the tractriX, known as the Shields antifriction curve," or any other suitable curve," to avoid unequal wear between them and the packing-strips P4 in the wings A2 of the pistons. Said wear is caused by the difference in circumferential travel of the inner and 13o outer ends of said packing-strips on packingplate H4. The same curve may be applied to the disks C of cylinder C, where the packing-strips P in abutment l, Figs. 2l and 22,

The abutment I is so coni ro ders C.

are in contact with the said disks for the same reasons as above described. Said heads 1I Il are provided with the steam and exhaust ports S and T.

Referring to Figs. 4, 12, and 13, the cam is shown as constructed with the outer flange F and the inner flange F forming between them the cavities F2, in which the cam-block ftravels. This cani-block has the journalbox f3, which receives the journals I)3 of the lever D, which has the journal-box cl2, which receives the crank a2 and the piston-shaft a.

It is evident that as the pistons rotate with the cylinders they must necessarily, by means of the crank-shaft a and lever D, as described, carry the camblocksf3 As these blocks travel in said cavities F2, it will be seen that the distance of the canrblocks f from the center ofY said rotating cylinder C must be changed, said cams having periods of rest rc3 003 and 5v5 and periods of throw :r2 at? and fr fc4, as shown in Fig. l2. The cam F F is constructed so as to have the least possible throw sufficient to oscillate the pistons. This is accomplished by placing the said cam outside of the circle described by the pistonshaft e, so as to obtain a throw comparatively small in proportion to the diameter of the cam, so as to avoid or modify jar. During the periods of throw er? .r2 and .ff-,4 x4 the pistons are balanced, as previously described, and oscillate or rotate so as to pass the abutment I and travel with the rotating cylinders. During the period of rest r3 said pistons pass the abntments I, and during the period of rest .frs they propel and rotate the rotating cylin- Said cylinders C are securely attached to shaft N. Shaft N is therefore driven by the pistons through the agency of the rotating cylinders. The oscillations or rotations of the pistons are controlled by said cams through the agency of the lever D and camblocks f. Said cam may be attached to the base-plate W or to the outer casing G, as shown in Figs. 2 and i. The center lines Y Y and X X, respectively, of the abutments I and of the cam F F should not coincide. The angle of difference between said center lines is such as to allow for the distance of lead or follow of the crank a2 past the center of the piston-shaft a, so as to have the center of rest @r3 in said cam coincident with the center of the abutments I.

Referring to Figs. i and 8 to 11, inclusive, it will be seen that the lever D is constructed with the journals D3, which have a bearing in the journal-boxes f3 of the cam-bloels f and the journal-boxes cl2, which receive the crank a2 of the piston-shaft a. The guides D4 work over the shaft N and hold the lever in proper position with respect to the crank a2 of the piston-shaft a and the cam-blocks f. The counter-balances D5 on the lever D are placed so as to counterbalance the centrifugal force of the end which is provided with the journals D3 and journal-box 07.2. Said lever is provided with gib-blocks (Z and dito facilitate placing in position, as shown in Figs. 2, et, lO, and 11. The lever D is identical in construction and operation with the lever D.

The operation is as follows: Referring to Fig'. 3, it will be seen that piston A, having The piston A in turn takes the position formerly occupied by piston B. Continuing the revolution, piston B, after passing the abutment I, again oscillates, taking the position as shown at A1", and is acted on bysteam from port S. It is evident that the piston A has taken the position as shown at B10, and the steam which has just propelled it is ready to exhaust at port T. Piston A then oscillates to take its original position. Piston B also takes its original position, as shown. This constitutes a full stroke. The steam passes freely from one cylinder into the other through the passages Y, thus admitting steam simultaneously on the pistons A A and on B and B', respectively. essarily operate in the same mannen The steam and exhaust ports S3 T3, respectively, may be provided in the easing-heads II H, as shown in Fig. 3, so as to make the engine The pistons A and B nec- IOC reversible, the steam and exhaust ports S and T being closed. A suitable cnt-off of the usual kind may be used at the steam or exhaust ports, or both. The steam-chests S and the exhausts T may be located on heads II H', as shown in Fig. 1. The cut-offs in the steam-chests S and S may be operated through the levers U U2, attached to rocker-shaft U, which is mounted in journal-boxes V. Said levers U U2 may be operated by the eccentric and eccentric-rod R and R', respectively. Vh ere a non-reversible engine is desired, one steamchest and one exhaustport are suffi-V cient, the steam passing' from one cylinder to the other through passages Y in Y.

IVhile four pistons and two abutmen ts have been shown, I do not limitmyself to this number, as any number 'may be used, with all their corresponding parts; and, further, I do not confine myself to the exact construction shown, as the same may be varied without departing from the spirit of my invention.

IIaving thus ascertained and set forth the construction of my invention, what I claim IIO as new, and desire to secure by Letters Patent,

tons connected in pairs by a shaft, and rotating cylinders connected by passages for the simultaneous, introduction of pressure into the cylinders, whereby the end pressure resulting in friction is avoided, substantially as set forth.

3. A rotary engine having oscillating pistons connected in pairs by a shaft, and rotating cylinders connected on their adjacent sides by passages for the simultaneous admission of steam to balance against the end pressure, said cylinders being closed on the outer sides by stationary heads, substantially as set forth.

4. A rotary engine having oscillating pistons connected in pairs by a shaft, and rotating cylinders formed by inner and outer rings and adjacent disks, said cylinders being connected by steam-passages through said disks and the open ends abutting against and being packed on stationary heads, substantially as set forth.

5. A rotary engine havingoscillating pistons connected in pairs by a shaft, and rotating cylinders formed by inner and outer rings and adjacent disks, said cylinders being connected by steam-passages through said disks and the open ends abutting against and being packed on stationary heads, said cylinders being firmly attached to a driving-shaft, substantially as set forth.

6. A rotary engine having oscillating pistons connected in pairs by a shaft, and rotating cylinders formed byinner and outer rings and adjacent disks, said cylinders being connected by steam-passages through said disks and the open ends abutting against and being packed on stationary heads, said cylinders being firmly attached to a drivingshaft and mounted in journal-boxes attached to said stationary heads, substantially as set forth.

7. A rotary engine having rotating cylinders provided with annular cavities, said cylvinders having seats for oscillating pistons connected in pairs by a shaft, which revolve with the cylinders, said seats being formed by the enlargement of said cylinders, substantially as set forth.

8. A rotary engine havingl rotating cylinders provided with annular cavities, said cylinders having seats for oscillating pistons connected in pairs by a shaft, which revolve with the cylinders, said seats being formed bythe enlargement of said cylinders and having heads provided with journals to receive V'the shafts of the oscillating pistons, substantially as set forth.

9. Arotary engine having rotating cylinders provided with annular cavities, said cylinders having seats for oscillating pistons, which revolve with the cylinders, said seats being formed by the enlargement of said cylinders and having removable heads provided with journals to receive the shafts of the oscillating pistons, substantially as set forth.

10. A rotary engine having cylinders formed by outer and inner rings, and adjacent disks forming between them annular cavities, said cylinders having seats for oscillating pistons, which revolve with the cylinders, said seats being formed by the enlargement of said cylinders and having heads provided with journals to receive the shafts of the pistons, said heads being in the adjacent disks, substantially as set forth.

11. A rotary engine having stationary heads and packing-plates and rotating cylinders provided with cavities, and pistonseats formed by enlargements thereof, said pistonseats having flanges on the open side to complete the circles formed by the inner and outer peripheries of said cavity, so as to allow the ring-packing to be used in packing said cylinder against said head, substantially as set forth.

12. In a rotary engine having oscillating pistons connected in pairs by a shaft and stationary cylinder-heads, and rotating cylinders forming annular cavities open at outer sides, said cylinders being packed against said heads on the said open side, substantially as set forth.

13. In a rotary engine having stationary heads and rotating cylinders forming annular cavities open at outer sides, said heads having protruding annular packing-plates which are packed Within said cylinders on the open side, substantially as set forth.

14. In a rotary engine having rotating cylinders into which stationary abutments extend, said cylinders having piston-seats to receive oscillating pistons connected in pairs by a shaft, and said pistons having wings which are curved so as to pass by and be packed in passing said abutments, substantially as set forth.

15. In a rot-ary engine having rotating cyl-l inders into which stationary abutments extend, said cylinders having piston-seats to receive oscillating pistons connected -in pairs by a shaft, and said pistons having wings which are curved so as to pass by said abutments, substantially as set forth.

16. A rotary engine having rotating cylin- `ders provided. with seats for oscillating plstons, said pistons constructed of a disk and curved Wings connected by a crank-shaft which oscillates them, substantially as set forth.

17. A rotary engine having rotating and oscillating pistons and crank-shafts, respectively, and mounted in seats and journals provided for them in said cylinders, said pistons lOO IIO

with diamotrically-opposed wings balancing` each other against centrifugal force during oscillation, substantially as set forth.

l). A rotary engine having oscillating pistons connected in pairs by a shaft and rotating cylinders into which extend stationary abutments, said pistons when under pressure being at rest with respect to and rotating said cylinders, the pistons oscillating and passing said abutment when not under pressure, thereby' avoiding all friction due to oscillation-of said pistons under pressure, substantially as described.

20. A rotary engine having oscillating pistons connected in pairs by a shaft and rotating cylinders, into which cylinders extend stationary abutments having curved projections protruding in opposite directions to reduce the waste-steam area, said pistons in passing the abutments being packed and in oscillating clear the curved proj cctions, substantially as set forth.

21. A rotary engine having rotating cylinders provided with oscillating pistons which are connected bya shaft, and stationary abutments protruding therein and packed in said cylinders, said abutments attached to stationary heads which are also the heads of the cylinders, substantially as set forth.

22. A rotary engine having rotatingI cylinders with seats to receive oscillating pistons, said seats having packing-strips held in place by pins in oblong holes and adapted to pack said pistons, sul'rstantially as set forth.

23. A rotary engine having rotating cylinders and oscillating pistons and packingstrips held in place by pins in oblong holes and projections for holding springs in place, substantially as set forth.

24. A rotary engine having rotating cylinders and oscillating pistonsconnected in pairs by a shaft and packing-strips held in place by pins in oblong holes, substantially as set forth.

25. A rotary engine having rotating cylinders and oscillating pistons and packingstrips beveled on the contact sides, substantially as and for the purpose set forth.

26. A rotary engine having rotating cylinders, oscillating j 'ristonsconnected in pairs by a shaft, abutments mounted on stationary heads, and a stationary cam which oscillates said pistons 'in passing said abutments, substantially as set forth.

27. A rotary engine having rotating cylinders, oscillating pistons, abutments mounted.

on stationary heads, and a stationary cam which oscillates said pistons to pass said abut ments, said. cam having grooves running alternately concentric and eccentric to control said pistons, whereby the pistons are held stationary with regard to said cylinders and are oscillated to pass said abutments, respectively, the pistons in oscillating and passing said abutments rotating with the cylind er and being at rest with respect to said cylinder in propelling and rotating it, substantially as set forth.

2S. A rotary engine having rotatingl cylinders, oscillating pistons, abutments mounted on stationary heads, and a stationary cam located between said rotating cylinders, said cam controlling the movements of the oscillating pistons, substantially as set forth.

29. A rotary engine having rotating cylinders, oscillating pistons with ltheir shafts and abutinents mounted on stationary heads, and

la stationary cam located between said rotating cylinders, said cam being located beyond the circle described by said piston-shafts, thereby producing a cam of large diameter and small throw, substantially for the purpose set forth.

30. A rotary engine having rotating cylinders, oscillating pistons with their crankshafts and abutments mounted on stationary heads, a stationary cam, and levers with their ends moving in said cam and oscillating and controlling said pistons through their crankshafts by means of said cam, by which they are operated, substantially as set forth.

3l. A rotary engine having rotating cylinders, oscillating pistons with their crankshafts, abutments mounted on stationary heads, a stationary cam, and levers with their ends moving in said cam and oscillating and controlling said pistons by their crank-shafts by means of said cams, by which they are operated, said levers being provided with guides which pass around the main drivingshaft, on which they slide, thereby holding said levers in position with regard to the cam travel and piston crank-shafts, substantially as set forth.

A rotary engine having rota-ting cylinders, oscillating pistons with their crankshafts, abntments mounted on stationary heads, a stationary cam, and levers with their ends moving in said cam and oscillating' and controlling said pistons by their crank-shafts by means of said cams, by which they are operated, said levers beingl provided with guides, substantially as set forth.

A rotary engine having rotating cylinders, oscillating pistons with their crankshafts, abutments mounted on stationary heads, a stationary cam, and levers with their IOO IIO

ends moving in said cam and oscillating and controlling said pistons by their crank-shafts by means of said cams, by which they are operated, said levers being provided with counter-balances to overcome centrifugal force, substantially as set forth.

Si. A rotary engine having rotating cylinders, oscillating pistons with their crankshafts, abutments mounted on stationary heads, a stationary cam, and levers with their ends moving in said cani and oscillating and controlling said pistons by their crank-shafts by means of said cams, by which they are ope ated, said levers having cam-blocks moving in said cams.

35. A rotary engine having rotating cylinders, oscillating pistons with their crankshafts, abutments mounted on stationary ders, oscillating Vpistons connected in pairs by a shaft, abutments mounted on stationary heads providedwith steam and exhaust ports,

said cylinders being connected by passages which equalize simultaneously*the pressure in each, for the purpose setV forth.

37. A rotary'engine having rotating cylinders securely attached to a driving-shaft, oscillatin g pistons connected in pairs by a shaft, abutinents mounted on stationary heads, said heads provided with j ournal-boXes which receive the said driving-shaft, said boxes eX- tending inward to enable the engine to be shortened, substantially as and for the purpose set forth.

38. A rotary engineY having rotating cylinders, oscillating pistons with the crankshafts, abutments mounted on stationary heads, a stationary cam, and ilevers moving in said cam, by which they are operated, said levers being provided with' the gib-blocks d to facilitate placing in position, substantially as set forth.

39. A rotary engine having rotating cylinders, oscillating pistons with the crank-shafts, abutments mounted on stationary heads, a stationary cam, and levers movingin said cam, Vby which they are operated, said levers being provided with the gib-blocks d4 tovfacilit'ate placing in position, substantially as set forth.

40. In a rotary engine having stationary heads, oscillating pistons, and rotating cylinders forming annular cavitiesopen at outer sides, said heads having annular packingplates which pack against said cylinders, the faces of said plates and end of pistonsin contact therewith being made to an anti-friction curve to avoid unequal Vwear between the aitthends and saidfaces, substantially set 4l. A rotary engine having oscillating pistons, rotating cylinders provided withl annular cavities, and stationary abutments pro-v truding and being packed in said cavities, the ends of said abutments and the faces of the annular disk of said rotatory cylinder being in contact therewith and forming an antifriction curve to avoid unequal wear between said ends and faces, substantially as set forth.

42. A rotary engine having rotating cylinders revolving within an outer casing, abutments, oscillating pistons connected in pairs by a shaft, and a stationary cam placed within and attached to the outer casing, said cam oscillatin g said pistons in passing the said abutments, substantially as set forth.

43. A rotaryV engine having rotating cylinders, oscillating pistons, abutments, and a stationary cam placed within and attached to the outer casing, said cani oscillating said pistons to pass said abutments and having grooves running alternately concentric and eccentric to control said pistons, whereby the pistons are held stationary with regard to said cylinders and are oscillated, respectively, to pass said abutments, the pistons'in osciliating passing said abutments rotating with the cylinder and being at rest with respect to said cylinder in propelling and rotating it, substantially as set forth.

44. A rotary engine having rotating cylinders Vrevolving within an outer casing, abutmen'ts, oscillating pistons, and aY stationary cam placed within land attached to the outer casing, said cam oscillating said pistons in passing the said abutn'ien'ts, substantially as set forth.

45. A rotary engine having rotating cylin` ders revolving within an outer casing, abut- -ments, oscillatingfpi-stens, and a stationary cam placed between the said cylinders and Within and attached to the outer casing, said cam oscillating said pistons in passing the said abutinents, substantially as set forth.

YIn testimony whereof I, SAMUEL GLENVILLE BRosIUs, have signed my naine to thisfspecification, in the presence 0f `two subscribing witnesses, on this 21st day of March, A. D'. 1891.

' SAMUELiGLEN-VILLE BROSIUS.

Witnesses:

Trios. J. STALEY, J. HENRY KAIsER.