Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 105
iiett!r. 94 ELEMENTARY TELEGRAPHY lip iu the tube wlien it rotates or swings iu the magueticfield between the poles. The Westou voltmeter is a moving coil galvanometerAvith its scale marked to give direct voltage readings.The movable coil consists of a niimber of turns of finewire wound iipon a… … Fi<:. 75.—The elements of the Weston voltmetei-. pieces insures the concentration of the field of the largepemianent magnet shoAAii in Fig. 75. The movable coilis controlled by two flat spiral hair-springs which arewound in opposite directions; consequently, when oneis twisted up by a movement…
Telegraph
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