Core-less induction coils in telephone service (1907)
Smith, Claude E, Stewart, Walter M · leaf 16
tlines, but on comparatively long lines the tra iswission would bepoor, and prove unsatisfactory, because of the xack of the ironcore. I may say that this coreiess coil transmited sound v/hichwas practically the same as that transmited by the large thirty-ty inch coil, which v;iil next be… … cxe rim giving, a resistance of 8 ohms. The secondary consisted of168 turns of # 36 copper v/ire wound on a 28 inch bicycle rim, giv-ing a resistance of 518 ohms. The current in the primary wab sup-plied by two standard gravity cells in series. When comparing thiscoil v/ith the standard Coil, the…
Induction coils · Telephone · Telephone systems · Theses
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