THE VALVE-GEAR 99 



lever and turning the forked head on the rod until the 

 required length is obtained. The jam-nut should then 

 be tightened to prevent lost motion. 



Second. Location of Eccentric. See that the eccentric 

 is in the proper position, which is, with its point of great- 

 est throw nearly opposite the engine crank-pin on all 

 engines except the one hundred and ten horse-power, on 

 which it is in line with the crank-pin. The movement of 

 the valve in throwing the lever from one end notch to the 

 other end notch of the quadrant, with the engine on its 

 dead-center, is called the "slip." When the eccentric is 

 properly located, the "slip" will be the same for "head" 

 dead-center as for "crank" dead-center. The "slip" must 

 not only be alike in amount, but must also be in the 

 same direction as that in which the lever is moved, in 

 both cases. If the "slip" be with the lever for one dead- 

 center, and against it for the other, the eccentric is not 

 in the correct position, and should be rotated slightly on 

 the shaft, until the "slip" is in the same direction as 

 that in which the lever is moved, for both dead-centers. 

 If it be impossible to get this, the pedestal is not the 

 right height, as explained in the following paragraph. 

 In setting the eccentric, one set-screw will hold it in place 

 temporarily. 



Third. Height of Pedestal. See that the pedestal 

 is the correct height. The amount of "slip" indicates this, 

 and if it be one-sixteenth for both dead-centers, and in 



