The inventions, researches and writings of Nikola Tesla : with special reference to his work in polyphase currents and high potential lighting (1894)
Martin, Thomas C, Tesla, Nikola · The Electrical Engineer · leaf 477
e pieces and armatures upon the friction clamp , and Fig . 282 is a section of the clamping tube . m is a helix of coarse wire in a circuit from the lower carbon holder to the negative binding screw — . x is a helix of tine wire in a shunt between the positive binding screw - ( - and the negative… … Fig . 280 . Fig . 281 ] > ost . - f - through the plate s 2 , carbon holder s , and upper carbon to the lower carbon , and thence by the holder and a metallic connection to the helix m . The carbon holders are of the usual character , and to insure electric connections the springs / are made use of…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-257-184.webp)
