ARMATURE LAMINATIONS 



19 



TABLE IV. 



TABLE FOR RECORDING TESTS ON IKON. 



If we represent by 1*00 the hysteresis loss in waits per kg., 

 when the density is 4000 lines per sq. cm. and the periodicity 

 is 50 cycles per second ; then for any other density, but the 

 same periodicity, the hysteresis loss will be found by multiplying 

 by the corresponding constant in Table V. Thus if, from the 

 Ewing hysteresis tester results, we have ascertained that a certain 

 sample has a hysteresis loss of 0*73 watts per kg. at 50 cycles 

 per second, and a density of 4000 lines per sq. cm., we can 

 determine the loss at a density of, say, 11,000 lines per sq. cm. 

 and 50 cycles per second, by multiplying as follows : 



073 x 5-2 = 3-8 watts per kg. 



If the periodicity is also different, the change in the hysteresis loss 

 will be directly proportional to the periodicity. Thus at 60 cycles 

 per second, and 11,000 lines per sq. cm., the hysteresis loss in the 



above sample will be 



f\c\ 

 073 x 5-2 x = 4-6 watts per kg. 



