The Electric Telegraph |
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Common terms and phrases
acid angles apparatus armature arrangement atmospheric electricity attracted axis back contact beam cable charge circuit clockwork coils commutator conducting power conductor connected consists construction contact peg copper copper wire core current passes cylinder deflection dial direction disc discharge distance Earth Fig electricity electro-magnet electro-motive force element equal galvanic galvanometer galvanoscope gutta-percha Gutta-percha Company holes india-rubber inserted insulated intensity intermediate station interrupted knot length letter lever Leyden jar line battery line wire local battery magnetic needle means measuring mercury metal method millimetre Morse motion Ohm's law opposite paper strip plates platinum pointer polarised pole positive current posts pressed printing R₁ ratchet-wheel relay resistance rheostat screw shown in Fig shunt side Siemens Siemens and Halske signals soft iron specific gravity spring submarine sulphuric acid surface switch tangent galvanometer telegraph temperature terminal tion transmitting tube turned type-wheel unit upper vulcanite wheel whilst zinc