238 SCIENCE OF SUCCESSFUL THRESHING 



the bearings and worm gears of the automatic device for 

 swinging the straw chute should be oiled. 



Speed of Stacker Fan. 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 r. p. m. 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 de- 

 livers 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 manner as the wind-stacker. The turret, however, 

 which has the mechanism for driving the rake, in addition 

 to the parts used on the wind-stacker, is attached eight 

 inches higher than that of the wind-stacker, in order to 

 bring the carrier sufficiently high to swing clear of the 

 deck of the separator. Holes are provided in the posts 

 of the frame for attaching the turret in the positions re- 

 quired by either the combination or wind-stacker. After 



