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 410
ip C. Another sheet of mica and athin sheet of copper sheath held in place by a clip at the heel, con-stitutes the complete heating element of the iron. The coils are detach-able and interchangeable. In case of a burn out, only one side need bereplaced. By means of a detachable plug the iron can be… … Fig. 4,420.—Nest of electric soldering bits, showing various forms and sizes. consumption from 55 watts for the small, long, narrow pointedtool, suitable for intermittent telephone switchboard repairwork, to 350 watts for the largest size, equal to a 6 poundsoldering copper. The heating element has…
Electrical engineering
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