A laboratory manual in physics, to accompany Black and Davis' "Practical physics for secondary schools," (1913)
Black, Newton Henry, 1874- [from old catalog] · New York, The Macmillan company · leaf 90
with sul-phuric acid (H2S04) and containinga little alcohol. The gain plate (cath-ode) is first made perfectly clean byrubbing with fine emery until bright,and then wiping with a clean drycloth. After it is cleaned, the partwhich is to be immersed must not betouched by the fingers. Weigh this clean… … —J Cathode [ Fig. 44
Physics
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