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 432
m-perature throughout the day. For smaller coppers one flame is sufficient. When a largeheating power is required it is often desirable to use both blasts throughout the day. A heavy bit is preferable for jointing work, as one weighing less thantwo pounds does not retain the heat long enough.… … enough to melt a stick ofsolder rapidly when it islightly pressed against it.When the bit is at theright temperature, theheat can be felt when it isheld close to the face. Whenhot enough clean up thesurface of the copper withan old file. If the temper-ature be too high, thecopper surface will…
Electrical engineering
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