Turned from a Bar of Pure Lead supplied by Messrs. Baxendale, Manchester. Density at 25° C. = 11 ‘29. 
1 ‘90 centims., approx, k = '082, therefore b' = - 23, x A — ‘33, x B = 2 - 69, x v = 3 - 02, x c , = 3T7 centims. s = 1 - 83 sq. centims. 
CONDUCTIVITIES OF METALS AND ALLOYS AT LOW TEMPERATURES. 415 
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Duration of experiment, 5 hours 30 minutes. 
* See note on p. 407. 
