132 SCIENCE OF SUCCESSFUL THRESHING. 



750 and the regular pulley 5294/1 for this is 13^ inches in 

 diameter or 42 inches in circumference. Multiplying 750 by 

 42 gives 31,500 inches as the product. Dividing this by 12 

 to reduce to feet gives 2625 feet per minute as the required 

 travel of the belt. If this be 120 feet long, dividing by 120 

 gives 22 (nearly) as the required number of rounds of the 

 belt per minute. With a 150 foot belt, the number of rounds 

 will be nearly 18 or vdth 160 foot belt 17 (nearly) 

 rounds. In the same manner, the required number of rounds 

 can be figured for any cylinder speed, cylinder pulley or 

 length of belt. 



Cylinder Boxes. The cylinder boxes are the most im- 

 portant bearings on a separator and they must receive a cer- 

 tain amount of attention or there will be trouble. All Case 

 20 bar cylinders are fitted with ball and socket boxes, which 

 practically eliminate all possibility of their heating from 

 improper alignment. The boxes are eight inches long, allow- 

 ing a good bearing surface for these large cylinders and are 

 fitted with oil cups which hold a sufficient quantity of oil to 

 amply lubricate the bearings. The 12 bar cylinders of the 

 steel separators also have ball and socket or "self-aligning" 

 boxes. The chapter on "Lubrication and Hot Boxes" should 

 be read with special reference to the cylinder boxes. 



To Take "End Play" Out of the Cylinder. Loosen lower- 

 half of housing of box by slacking the nuts which secure it, 

 and slide it against hub of cylinder head. The holes in the 

 ironsides are slotted to allow for this end adjustment and also 



