PRODUCTIOlSr OF SWEET-OEANGE OIL. 



15 



The grating surface of the drum is made of No. 24 galvanized iron, 

 cut into strips 4 inches wide and punched to form the special teeth 

 required. These teeth are formed by a triangular punch with two 

 sides straight and the third beveled to form the point. The punch 

 should be adjusted so that when used on a lead block a triangular 

 tooth will be cut, having one point exposed. The teeth are from 

 three-sixteenths to one-fourth of an inch long, with the point raised, 

 from three thirty-seconds to one-eighth of an inch. They are about 



Fig. 6. — Perspective view of the peeling machine. 



three-fourths of an inch apart each way and so placed that when the 

 strips are in position on the drum the teeth wiU project in the direc- 

 tion in which the drum rotates. It is essential that the point and 

 edges of the punch be kept sharp, in order to make a clean-cut tooth 

 having a sharp point. It is desirable to mark off the strips on the 

 sheet of galvanized iron and punch the teeth before cutting the 

 strip, leaving a margin of at least one-half an inch on each edge. 

 This prevents the strips from being warped out of shape in the punch- 

 ing process. 



