76 



ELECTRICAL MACHINERY 



wound armature; it may be seen that all of the winding 

 is placed on the periphery of the armature. 



FIG. 39. View of a Drum-wound Armature. Westinghouse Elec. 

 and Mfg. Co. 



The next distinction to be made is between the open 

 and the closed winding. In Fig. 40 are shown two ring 



PIG. 40. Open-circuit and Closed-circuit Windings. 



wound armatures; (a) represents the winding of a Thom- 

 son-Houston arc light generator, which was once used very 



