CONTINUOUS-CURRENT WINDINGS 155 



doubly re-entrant, since the greatest common factor of 38 and 2 

 is equal to 2. 



The formula c = ny2m is complied with, since we have 



300 = 8x38-2x2 



= 304-4 

 = 300 



In Fig. 186 the pitch is 37 at both ends, and since the greatest 

 common factor of 37 and 2 is 1, the winding is singly re-entrant. 

 That the formula C = 7i2/2m is also complied with in this case, 

 may be seen by substituting as follows : 



300 = 8x37 + 2x2 

 = 296 + 4 

 = 300. 



In Figs. 187 and 188 are shown eight-pole, two-circuit triplex 

 windings. The values of C, n, y and ra, and the re-entrancy, are 

 as follows : 



Fig. 187. Fig. 188. 



Number of face conductors (C) . 306 298 



poles (n) . 88 



Degree of multiplexity (m) 3 3 



Front end pitch (yf) . 39 37 



Back (yl) ... 39 39 



Mean pitch (y) . . . 39 38 



Greatest common factor of y and m . 3 1 



Ee-entrancy .... 3 1 



As to compliance with the formula C = 7ii/2m we have: 



Fig. 187. Fig. 188. 



306 = 8x39-2x3 298 = 8x38-2x3 

 = 312-6 =304-6 



= 306 =298 



One could develop an endless number of interesting varieties 

 of these windings, but inasmuch as they are at present of much 

 less general utility than simplex windings, it would be out of place 

 in the present treatise to devote much more space to their con- 

 sideration. New developments in the design of dynamo electric 

 machinery might, however, bring these windings to the front. 

 The last winding of this type which we shall show is that of 



