Modern Practice of the Electric Telegraph: A Technical Handbook for Electricians, Managers, and Operators, with 185 Illustrations
D. Van Nostrand Company, 1891 - 234 стор.
Magnetismus, Elektromagnetismus ; Elektrotechnik ; Telegrafie (Nachrichtentechnik).
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action adjusted ampere-turns amperes apparatus armature artificial line battery brass centimetre closed coil conductivity conductor connected contact-points convenient copper plate copper wire Daniell cell deflection diagram diameter direction distant end distant station dots dynamo Dynamo-Electric earth effect electric circuit electric current electric telegraph electro-magnet electromotive force equal gauge glass gravity cell ground helix hence hydrometer Illustrated instrument insulation key K1 length lever line-wire lines of force loop magnetic field magnetic force magnetic needle metallic miles neutral relay number of cells number of turns Ohm's law ohms operator pegs placed polar relay pole position potential practical principle produced proportion quadruplex quantity of current ratio resistance rheostat ring s. z. solution screws shown in Fig signals single-current soft iron sounder switch tangent galvanometer telegraph line termed terminal station thick tion transmitting unit usually voltaic volts Wheatstone Bridge wire zinc zinc plate
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