THE CYLINDER, CONCAVES AND BEATER 



155 



usual speed. Some grains and legumes require special 

 cylinder speed for which a change in cylinder pulleys is 

 desirable. These are given elsewhere in this book. 



MAIN CYLINDER PULLEYS. 



Ascertaining Cylinder Speed. The best way to as- 

 certain the speed is by means of a revolution counter, 

 but if one be not at hand, the speed may be found by count- 

 ing the number of times the main drive belt goes around 

 in a minute. To do this, multiply the required speed of 

 the cylinder by the circumference of the cylinder pulley in 

 inches and divide by 12 to reduce to feet. Dividing by 

 the length of the belt in feet will give the required number 



