THE POLYPHASE SYSTEM. 



105 



choice of signs, the clock diagram which shows the currents a, 

 b and c and the electromotive forces A, B and C in the re- 

 spective windings, becomes symmetrical as shown in Fig. 99. 



main 1 



Fig. 98. 



() &- Connection. The three armature windings of a three 

 phase alternator, when A-connected, form a complete circuit or 



mesh, and the essential features of this scheme of connections 

 are best shown by a symmetrical diagram like Fig. 100. // is 



