— 12 — 



But to make assurance doubly sure, a barrel-shaped frame covered with 

 woven wire of very small mesh, and fitting the flume closely, could be 

 operated as a revolving screen, by utilizing the paddle wheel as a motor. 

 The pulleys to each should be placed on the shafts just outside of the 

 flume, with the belt crossed so as to cause the wheel and sci-een to revolve 

 in opposite directions, the revolving screen, of course, being at the en- 

 trance of the ditch. This forms a self-cleaning screen, all leaves and 

 trash being carried over, while the smallest fish fry are prevented from 

 passing it. I thiuK, however, that the paddle wheel alone would answer 

 the purpose very effectually. 



The annexed rough drawings may make the device and its con- 

 struction more easily understood. For very shallow ditches the paddles 

 might be nailed directly to the octagon shaft. Farmers who are skilled 

 in the use of tools might make a round shaft, with mortises for the arms 

 of the wheel, but it would be no better or stronger than the simple one 

 mentioned. 



JAMES A. HENSHALL, 



Bozeman, Montana. 



