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 420
copper, 10 parts. No. 2. Silver, 20 parts; copper, 30 parts; zinc, 10 parts. 3,074 HAWKINS ELECTRICITY In addition to the various silver solders already given, two otherformulae should be included. No. 1. Yellow brass, 70 parts; zinc, 7 parts; tin, 113^2 parts. No. 2. Silver, 145 parts; brass (3… … Fig. 4,425.—Soldering pot. Solder for silver chains: No. 1. Fine silver, 74 parts; copper,24 parts; orpiment, 2 parts. No. 2. Fine silver, 40 parts; orpiment,20 parts; copper, 40 parts.
Electrical engineering
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