Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 528
urface conducting. It is then thoroughly washedvith water. Although graphite will conduct the current by simply placing aprepared plate in the bath, it is not always easy to obtain good contact.It is usual, therefore, to either coat the mould with copper by somechemical process, or to drive little… … Fig. 4,604.—U. S. electro-plating and self-emptying barrel for brass, nickel, copper, tin, zinc, etc.Method of galvanizing: After pickling and cleaning the material the galvanizing barrelis then filled by means of pails, shovels, etc., with from 150 to 200 lbs. of material at a time,and is then…
Electrical engineering
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