138 SCIENCE OF SUCCESSFUL THRESHING 



which permit movement sufficient to allow the shaics to 

 be removed. It is necessary to remove the wood piece 

 with slide attached, which is on the rear axle. 



Reversing the Gearing. The bull-wheel may be 

 turned over, the short shafts interchanged and the spur- 

 wheel shaft reversed (end for end), so that the teeth of all 

 the gearing may be worn on both their faces. 



Reverse Motion of Tumbling-Rods. The direction in 

 which the tumbling-rods revolve may be reversed so that 

 they turn in the same direction as that in which the horses 

 walk, instead of turning, as usual, in the opposite direction. 

 When reverse motion is necessary for driving machinery 

 other than "Case" separators, the following extra pieces 

 will be needed : one steady-bearing, IO4\V ; one short tumb- 

 ling-rod, oi25\V; and one extra knuckle. To attach the 

 parts, proceed as follows: First, bore a one and one-half 

 inch hole in rear axle, two and three-eighths inches from its 

 top and five and one-half inches from the center of the bolt 

 holding the casting, i84\V or 222\V. Then bolt steady- 

 bearing, IO4W, on the inside of the axle with seven-six- 

 teenths by four and three- fourths inch bolts. Next put 

 the knuckle on the spur-pinion shaft and connect it with the 

 short rod, oi25\V, which passes through the casting, 

 IO4W, and through the hole in the axle. 



Attaching Truck-Brake to Iron-Frame Horse-Power. 

 Put the brake pipe under the main frame with casting 

 2ioW, face down and on the right-hand side. The pipe 



