256 



ARMATURE CONSTRUCTION 



was one of the earliest form-wound coils to be adopted in America. 

 Its distinguishing characteristics comprised a bottom slot portion 

 shorter than the upper slot portion, thus allowing the end 

 connections to be looped downwards towards the shaft, and 

 shortening up the total armature length, which in a tramway 

 motor is an important consideration. 



FIG. 292. Former for Alioth Coils. 



Fig. 294 shows the shape of coil for the Eickmeyer winding. 

 The end portions of the coils are really laid up in two separate 

 more or less vertical planes situated one behind the other when 

 the winding is completed. It is this feature" which renders the 

 distance to which they project somewhat shorter than in the case 

 of a barrel winding, where the end portions lie up in two con- 

 centric cylindrical planes the ends projecting in the plane of the 

 armature surface, and not being bent down radially. 



