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UNIVERSITY' 



WATKU PKOPULS10N. 



syphons, to unite them into one continuous pipe; I, the bent 

 pipe uniting the upper tubular ring with the first in succession 

 of the syphons ; the proper situation for this pipe is that shown 

 in Figure 2, but for the sake of clearness and simplicity in the 

 drawing, it is shown in Figure 1 as if on the left-hand pipe and 

 syphon; m, the throttle-cock on the bent pipe/; n, the safety- 

 valve lever, and weight on the same ; p, the pipe of communica 

 tion from the last in the succession of syphons to the working 

 cylinder of the engine; r, the throttle-cock in the pipe p-, s, a 

 four-way cock, worked by the hand-gear, to direct the steam 

 alternately under and over the piston ; tf, the safety-valve in 

 communication with the dry pipes; u, the two cylindrical 

 casings surrounding the boiler-pipes, the space between the two 

 being filled up with a slow conducting medium ; v, the domical 

 covering over the cylindrical enclosure ; w, the flue leading out 

 of the enclosure into the casing of the working cylinder ; oj, the 

 casing of the working cylinder forming a continuation of the 

 flue ; ij, the further continuation of the flue to the chimney ; 

 z, the waste-steam pipe leading into the chimney ; 1, the steam- 

 pipes leading from the working cock into the top and bottom of 

 the working cylinder; 2, the working cylinder; 3, the piston 

 with metallic packing; 4, the piston-rod passing down through 

 a stuffing box at the bottom of the working cylinder, and also 

 continuing downwards, to form the rod of the propelling piston ; 

 5, the propelling cylinder ; 6, the water or propelling piston ; 

 7, the upper aperture leading to one of the tubes opening 

 through the stern of the navigable vessel ; 8, the lower aper- 

 ture leading to the other tube, opening also through the stern 

 of the navigable vessel; these apertures are made as wide as 

 the cylinder will allow, in order that they may have but little 

 depth, and not occasion an inconvenient length of the propelling 

 cylinder ; 9, a frame supporting the steam-cylinder upon the 

 propelling cylinder ; 10, the feed-pump for supplying the boiler 

 with water; 11, an arm fastened on the piston-rod to work the 

 feed-pump and hand-gear; 12, the hand-gear. 



"Now, whereas I claim as my invention, firstly, the inter- 

 posing between the boiler and the working cylinder of the 

 steam-engine a long many-curved heated pipe, through which 



