1278 



SUPPLEMENT. 



As it is absolutely necessary to have a steady and uniform motion to produce the best 

 possible sample from a winnowing machine, and as the velocity of the threshing machine 

 is subject to vary, from irregular feeding and other causes, the winnowing or dressing 

 machines are set in motion by a small water-wheel x, five feet diameter, on the axis of 



1139 



which is a bevel wheel twenty inches in diameter, working into a pinion on an inclined 

 shaft y. On the upper end of the shaft y is a bevel wheel working into a pinion, on the 

 axis of which is another bevel wheel giving motion to the shaft z, which turns the fanners 

 by means of small mitre wheels. 



Tlie bone-mill and chaff-cutting machine are driven by the mitre wheels y and k. On 

 the shaft 2 is a shifting pinion 3 of sixteen cogs (ten inches diameter), working into the 

 wheel 4 of 49 cogs (two feet four inches diameter), on the axis of which is a pinion 5 of 

 16 cogs (ten inches diameter), driving the wheel 6 of 49 cogs (two feet four inches 

 diameter), in the axis of one of the lower crushers : the upper pair of crushers are 

 driven by the wheel 6 working into a wheel 7 in the upper crush or spindle. The 

 crushing rollers are set to or from each other as the nature of the work may require. 

 When the bones are large, the upper pair of crushers only are used in passing the bones 

 the first time through, an inclined board being placed to prevent them from falling into 

 the lower set j this board is removed at the second time of grinding, and the bones pass 



