42 SCIENCE OF THRESHING. 



line strikingly show this increase. A good type of 

 fan was run at its normal slow speed of approx- 

 imately 400 revolutions per minute and furnished the 

 normal pressure. The speed was then gradually 

 increased one-quarter, or to practically 500 revolu- 

 tions per minute. It was found that the pressure had 

 increased about 16 2/3 %, and the power 35 1/3 %, 

 or in round numbers, an increase of one-quarter in 

 speed gave an increase of one-sixth in pressure and 

 used one-third more power. 



HANDLING THE THRESHED GRAIN. 



There are a variety of weighers, measurers, sackers 

 and wagon loaders on the market and in use to 

 handle the cleaned grain as it comes from the 

 machine. 



Included among these is a class that measures the 

 grain as it is threshed and registers the number of 

 bushels as delivered; also a class that measures the 

 grain instead of weighing it, and keeps a tally or 

 record of the amount. There is also a short sacker, 

 requiring a man to operate it, which aids in sacking 

 the grain, and a wagon loader which delivers the 

 grain to either side of the machine without making 

 record of the amount handled. 



