246 SCIENCE OF SUCCESSFUL THRESHING 



handlers require a left-hand grain auger. When it is 

 desired to attach one of these elevators to separators built 

 previous to the year 1899, which were fitted with the right- 

 hand grain augers, it is necessary to replace the old auger 

 by a left-hand one, or the attachment will not work. 



What to do when Weigher Fails to Dump. It is 

 seldom that the weighing mechanism fails to work prop- 

 erly, but it may do so from several causes. Some of the 

 parts may be sprung out of shape from careless handling, 

 causing them to bind or work hard. In case the weighing 

 hopper does not dump each time it is filled with the amount 

 of grain the weight is set for, first see that the hopper 

 moves freely up and down. Malleable Trip Bracket 

 I48CW or its guide may have become sprung so that they 

 do not engage freely. The trip-pin in end of I48CW 

 should disengage readily from trip-dog I3CW and it may 

 require filing to make it do so. It should lap about one- 

 eighth inch on the dog. The weight and scale-beam must 

 move freely without catching or rubbing on any stationary 

 part and end of beam must strike Rest 1 5oCW when down. 

 The Trip Crank 2oCW must be past its dead-center when 

 the trip-pin rests against the dog, so that the weight of 

 the cut-off (isCW and i6CW) will revolve the shaft 

 and engage the worm as soon as the trip-dog is released 

 by the downward movement of the hopper. The vertical 

 shaft must turn freely, except when stopped by the trip- 

 pin. The chain should be of such a length that it allows 



