40 



ARM A TURK CONSTR UCT1ON 



Frucht, in the article above referred to, thus describes the 

 process of making small armature discs : In a plate of suitable 

 size, as shown in Fig. 28, a central hole is punched, as also two 



FIG. 26 " Bliss" Circular Shears. 



slots which shall ultimately serve as key-ways. Although two 

 slots are illustrated, good practice has shown that only one key- 

 way suffices in such a case. Frucht showed four key-ways. The 



FIG. 27. Circular Shears with Angular Cutter Shafts. 



plate is then mounted in the circular shears, as illustrated in 

 Fig. 27, which, however, shows the plate after the completion of 

 the operation of cutting it circular. The upper knife may be raised 

 and lowered by means of hand-wheel W. If only the small central 



