459 



TABLE 479.— MAGNETIC PROPERTIES OF STEEL AT 0° and 100°C 



* The results in this and other tables for forces above 1200 were obtained from a small piece of the 

 metal provided with a polished mirror surface and placed, with its polished face normal to the lines of 

 force, between the poles of a powerful electromagnet. The induction was then inferred from the rotation 

 of the plane of a polarized ray of red light reflected normally from the surface. (See Kerr's Constants, 

 Tables 516, 517, 520.) 



t Magnetic moment per grain. % Magnetic moment per cm*. 



TABLE 480.— ENERGY LOSSES IN TRANSFORMER STEELS 



D. C. Hysteresis data 

 From B m az = 10,000 gausses 



Thickness 

 Grade in. 



Transformer 52 0140 



Transformer 58 0140 



Transformer 65 0140 



Transformer 72 0140 



Transformer 72 0185 



Transformer 72 0250 



Dynamo 0140 



Dynamo 0185 



Dynamo 0250 



Motor 0140 



Motor 0185 



Motor 0250 



Electrical 0140 



Electrical 0285 



Electrical 0250 



Armature 0140 



Armature 0185 



Armature 0250 



TABLE 481.— ENERGY LOSSES IN TRANSFORMER STEELS 



a c core losses 

 Watts/lb for 60 cycle at 10,000 gausses 



Thickness 

 Designation in. 



Transformer 52 0134 



Transformer 58 0137 



Transformer 65 0136 



Transformer 72 0136 



Dynamo 0137 



Motor 0140 



Electrical 0137 



Armature 0139 



Oriented C. R. strip 0140 



SMITHSONIAN PHYSICAL TABLES 



