Brass Rod. 
Turned from a Rod of Composition 70 Cu, ’30 Zn, approx. Density at 22° C. = 8'44. 
4*11 centims., approx, k = '16 to '26, therefore b' = '282 to '290, taken = '285, x x — '39, x B = 5'07, 
x c = 5'45, x c , = 5'64 centims., s = 1 '83 sq. centims. 
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* See note on p. 407. 
