The Electric Telegraph: Its History and Progress... |
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acid action aerial telegraph alarum alphabet Ampère apparatus appears armature arrangement Bain caused chemically marking circuit clocks coils of wire communication conductor constructed Cooke and Wheatstone copper current of electricity denoted desired dial disc discovery distant station earth effects elec electric current electric tele Electric Telegraph Company electro-magnet electrometer employed England experiments form of telegraph galvanic battery galvanometer German alphabet glass graph gutta percha Highton improvements insulated wires intermediate stations invention inventor keys length letters Leyden jar line-wire Liverpool London magnetic needle means of electricity ments Messrs metallic leaf mode Morse's motion move moveable observed obtained old Electric Telegraph paper pass patent was taken peculiar period person placed plates pointer points poles produced Professor Wheatstone ratchet-wheels sent signals soft iron Specification Steinheil Steinheil's telegraph sulphuric sulphuric acid telegraphic instruments transmission transmitted tricity tube Western Railway wire-rope zinc