344 EXPLANATION OF THE PLATES. 



The mechanism for opening and closing the steam passages consists of an 

 eccentric piece k, fixed on the crank shaft, the action of which communicates 

 a reciprocating motion to the rod i, which by a bent lever moves the connecting 

 rod /, and lever m, that is fixed at one extremity of a spindle having a beveled 

 wheel at the other ; which works into another on the spindle n of the steam cock o, 

 by which the steam is admitted from the steam pipe to the cylinder. The engine 

 is worked by hand by means of the handle h. 



A pair of beveled wheels on the fly wheel shaft gives motion to the governor 

 balls, and these raise or depress the piece marked p on the axis, which by its 

 peculiar form acts on a lever, and retains the valve in the steam pipe at g open for 

 a longer or shorter time for the admission of steam according to the velocity of the 

 engine, (see art. 547.) There is also an apparatus for working the throttle valve 

 by the same governor. 



This engine is in a very compact form : it is however a little too complex, and 

 its frame reminds one of an antiquated style of cabinet-work ; but the beauty of 

 the workmanship is unequalled, and is faithfully represented by Mr. Clement's 

 drawings. 



To proportion the parts of an engine of this kind, see art. 419 422. and the 

 articles there referred to ; and Table m. (art. 664.) It is adapted for engines of 

 from 2 to 30 horse power. 



