APPLIED MECHANICS. 



[DIRECT- AITI MI 



ratus w> wmplo and durable, that U capable of main- I by a rod with a small piston working in .1 .-ylindor ; the 

 tainiiig like rogul 1 engine puts in motion a small pump, forcing into this 



Another kind of governor has been applied, not with- 

 Fig. 195. 





oui raccou. Tho levor of the throttle valve is connected 



cylinder air or water, which escapes from it by an 

 aperture, the size of which can bo regulated at pleasure. 

 If the speed of the engine increase, the small cylinder U 

 filled more rapidly than it can empty itself, and the 

 piston thus raised closes the throttle- valve. Should the 

 engine move more slowly, the small cylinder becomes 

 emptied more rapidly than it is filled by the pump ; and 

 the piston descending, opens the throttle-valve so as to 

 admit more steam to the main cylinder. 



Other contrivances for governing the speed of engines 

 have been applied with success. Among them we may 

 mention the chronomctric governor, of which our limited 

 space does not permit us to give a detailed descrip- 

 tion. 



Having now described separately the principal parts 

 of which a non-condensing engine consists, we will discuss 

 some of the modes in which these parts can be most con- 

 veniently arranged. 



DIRECT-ACTING ENGINES. Figs. 193 and 194 

 are sections, transverse to each other, of a vertical, 

 direct-acting non-condensing engine ; and Fig. 195 a 

 plan of the same. A is the foundation-plate, forming 

 the bottom of the cylinder B, which is secured to it by 

 bolts and nuts. C, the slide and steam passages. D, 

 the piston and rod, terminating in a cross-lir:\<l K, which 

 works between guides, and to which is jointed the con- 

 i^-rod F. G, the crank ; and H H, the bearings 

 in which the crank-shaft revolves. I, the eccentric and 

 rod for working the slide ; and K, an eccentric fur work- 

 ing the feed-pump L. M, the fly-wheel. This engine is 



