ARCHIMEDEAN ROOT-WASHER. 197 



Fig. 105. 



The Screw of Archimedes 



ty. Its simplicity and small liability to get out of 

 order renders the Archimedean Screw sometimes use- 

 ful where water is to be raised from an open stream to 

 a short distance, as for krigation, the motion being 

 easily imparted to it by means of a small water-wheel 

 driven by the stream. 



ARCHIMEDEAN ROOT-WASHER. 



This principle has been successfully applied in the 

 Archimedean Root-washer {Fig. 166). The roots to 



Fig 166 



Croskill's Archimedean Root-washer. 



be washed are first delivered into a hopper, from which 



