266 



The Potato 



reached the comminutor they are practically free from 

 dirt. A diagram of this machine is shown in Fig. 23. 



The rasping machine consists of a cylinder about 30 

 inches in diameter and 36 inches long. It is made of 



Fio. 23. Machine for washing potatoes. 



wood and is covered with pieces of sheet iron punched 

 full of holes about | of an inch in diameter. These holes 

 have the rough edges outward. This rasping machine or 

 comminutor is shown in Figs. 24, 25. 



Basping cylinder or comminutor. 



The rate of revolution of the cylinder is about 600 a 

 minute. It revolves as near a brace of hardwood as pos- 

 sible, and the potato, being stopped from passing by the 

 brace, is reduced to a fine pulp by the rapidly revolving 

 drum. 



