TABLE 518.— VALUES OF KERR'S CONSTANT 



507 



Du Bois has shown that the rotation of the major axis of vibration of radiations normally 

 reflected from a magnet is algebraically equal to the normal component of magnetization 

 multiplied into a constant K. He calls this constant K, Kerr's constant for the magnetized 

 substance forming the magnet. 



TABLE 519.— TRANSVERSE GALVANOMAGNETIC AND THERMOMAGNETIC 



EFFECTS 



Effects are considered positive when, the magnetic field being directed away from the 

 observer, and the primary current of heat or electricity directed from left to right, the 

 upper edge of the specimen has the higher potential or higher temperature. 



E = difference of potential produced; T = difference of temperature produced; / = 



primary current ; — = primary temperature gradient ; B = breadth, and D = thickness, 



dx 

 of specimen ; H = intensity of field, cgs units. 



HI 



Hall effect (galvanomagnetic difference of potential), E = R — 



Ettingshausen effect ( " 

 Nernst effect (thermomagnetic 

 Leduc effect ( 



temperature), T = P— 



potential), E = QHB- 



it 



dx 



temperature), T = SHB — 

 dx 



Substance Values of R 



Tellurium + 400 to 800 



Antimony +.9 " .22 



Steel +.012 ".033 



Heusler alloy +.010 " .026 



Iron +.007 ".011 



Cobalt +.0016 ".0046 



Zinc — 



Cadmium +.00055 



Iridium +.00040 



Lead +.00009 



Tin —.00003 



Platinum -.0002 



Copper —.00052 



German silver — .00054 



Gold -.00057 to .00071 



Constantin —.0009 



Manganese — .00093 



Palladium —.0007 to .0012 



Silver -.0008 " .0015 



Sodium — .0023 



Magnesium —.00094 to .0035 



Aluminum —.00036 " .0037 



Nickel —.0045 " .024 



Carbon —.017 



Bismuth — up to 16. 



SMITHSONIAN PHYSICAL TABLES 



