1 84 SCIENCE OF SUCCESSFUL THRESHING. 



Speed of Stacker Fan. Ordinarily, with the twenty-bar 

 cylinder running at 750 revolutions, a twelve-inch cylinder 

 pulley (A30iH), should be used on separators up to and 

 including the 58 inch size. This gives a fan speed of 650 

 revolutions per minute. On separators with 62 ' or 66 inch 

 rears, a larger pulley (A2Q6H, thirteen and one-half inches), 

 should be used, which gives a fan speed of 720 revolutions 

 per minute. With the twelve-bar cylinder running at its 

 normal speed of 1075 revolutions, the eight and one-half 

 inch pulley (Ai3oH), will give the fan a speed of 665 revo- 

 lutions per minute. It is desirable to keep the speed of the 

 wind-stacker fan as low as possible, not only because it 

 makes good stack building easier, but also because it requires 

 less power to run. On page 516 of "Kent's Pocket-Book" an 

 example is given of a fan which took .25 H. P. to drive at a 

 speed of 600. The same fan required .70 H. P., or nearly 

 three times as much when the speed was increased to 800. 



Combination-Stackers. The combination-stacker has been 

 made because of the demand for a stacker that would give 

 the thresherman all the advantages of the simplicity and 

 freedom from litter of the wind-stacker, and, at the same 

 time, give the farmer, who desires to have his straw stacked 

 by men placed on the stack, a stacker which delivers the 

 straw onto the stack by means of an ordinary carrier and 

 carrier-rake. 



Attaching, the Combination-Stacker. Up to the point 

 of putting on the turret, this stacker is attached in the same 



