78 SCIENCE OF SUCCESSFUL THRESHING. 



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. 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 the same direction as that in 

 which the lever is moved, the pedestal is the proper height. 

 If the pedestal be too high, the "slip" of the valve will be 

 more than one-sixteenth, and if too low, it will be less, or if 

 very low, the valve stem will move in the opposite direction 

 to that in which the reverse lever is moved. The pedestal 

 may be raised, by placing "shims" of sheet-iron between it 

 and the frame at the place where it is bolted, and lowered, 

 by removing the shims. If there be none, the pedestal must 

 be taken to a machine-shop and planed off in order to 

 lower it. 



Fourth. When you know that the reach-rod is the 

 correct length; that the eccentric is in the proper position, 

 and that the pedestal is the correct height, give the valve 

 three-thirty-seconds of an inch "lead" on the crank-end for 



4 



the threshing-motion. The "slip" of the valve, in throwing 



