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 227
im at true economy in construction FIELD MAGNETS 207 Steel is sometimes used in place of wrought iron, and though lessefficient magnetically, it can be cast into the desired shape, thus avoidingthe somewhat expensive processes of forging and machining, which arenecessary in the case of wrought…
Electrical engineering
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