Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 895
lated wire N. The copper is soldered to a mass of lead C, which is perforated longitudinally at0 to allow the ends of the coil to pass to the binding-screws at F, by which the telephone is con-nected to the circuit. The metal mass D C is phonetically insulated by a sheet of India-rubber //.An… … »?rr.
Mechanical engineering -- Dictionaries
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