Turned from a Rod supplied by Messrs. Johnson and Matthey as ‘99 Al. Density at 20° C. = 2'70. 
4'38 centims., approx, k — ‘48, therefore b' = *31, x x = *41, x B = 5-41, x G = 572, x G , = 5'93 centims., s= 1/83 sq. centims. 
CONDUCTIVITIES OF METALS AND ALLOYS AT LOW TEMPERATURES. 413 
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