198 HYDRODYNAMICS. 



they pass into an inclined cylinder made of strips of 

 wood with grate-hke openmgs. The cylinder has two 

 portions separated by a partition, in the first of which 

 they remain while the handle is turned for washing 

 them. As soon as the washing is finished, the motion 

 of the handle is reversed, which throws them into the 

 other part, which has a spiral partition, along which 

 they pass till they drop into a spout outside. 



The same principle is adopted in the horizontal corn- 

 sheller, shown by the annexed figure {Fig. 167), al- 



Fig 167 



though this machine has no connection with hydraul- 

 ics. The corn in the ear is thrown into the hopper at 

 one end, and is quickly separated from the cob by rows 

 of teeth revolving in a concave bed and set spirally, 

 which, by this arrangement, carry along the cobs and 

 eject them from the other end. Tliis is a good corn- 

 shelling machine for horse-power. 



The sausage-mincing machine operates on a similar 

 principle. 



G-reat improvement has been made in the common 

 pump for farms within the past ten years. The best 

 cast-iron pumps, made almost wholly of this metal, far 



