144 



THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1951 



The temperature corresponding to the resistance between taps may be 

 taken as the temperature at the mean radius of the layers included. The 



ih 



e 



K o—-<>^ooo^<>^i)0(y\<>Jiy^ — o K 



2' 



■Wv 



WV 



IH 



Fig. 1 — Circuit for measuring temperature differences in tapped coils. 



140 



uj 120 



o 



< 



g 110 



z 



UJ 



100 



90 



70 



60 



50 



40 



0.5 



0.6 



0.7 0.8 0.9 1.0 1.1 



RADIUS IN CENTIMETERS 



Fig. 2— Temperature distribution in coil of 197 switch magnet. 



results of such measurements may be plotted as shown in Fig. 2. The 

 results given in this figure were obtained with a sample of the Vertical 

 Magnet of the Western Electric Company's 197 (Step-by-Step) switch. 



