264 



ARMATURE CONSTRUCTION 



By far the most ingenious combined winding form and 

 spreader is that invented in 1898 by A. P. Hanson for the Union 

 Elektricitiits Gesellschaft of Berlin, Germany. This machine not 

 only winds and spreads, but is also adjustable to many sizes of 

 coils, making it very useful for small factories where the outlay 

 for tools must be kept low. Figs. 305, 306, and 307 illustrate the 



FIG. 308. Three-turn Wire-wound 

 Armature Coil. 



Fu;. 309. Three-turn Wire-wound 

 Armature Coils. 



principle of this machine. Figs. 305 and 307 show the position of 

 the parts during the winding of the coil, the outline of which 

 latter is shown dotted in Fig. 307. When the coil is wound, it is 

 spread by sliding the piece holding one side, into the position 

 shown in Fig. 306, the ends of the coils drawing in towards one 

 another during the operation, along the axis shown in the plan 

 of Fig. 307. 



Figs. 308 and 309 show typical, finished, wire-wound coils. 

 Each of these coils is a, composite coil consisting of three 



