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 106
minium pointer moves over a graduated scale andmirror indicating, when the coil is deflected, the E.M.F.in volts. A similar instrument is designed for giving by directreadings the Talue of the currents in amperes or milli-amperes. In these ammeters the movable coil onlycarries a small fraction of… … Fia. 76.—Coils and connections of the megger. high resistance it Avould reduce the strength of the currentwhen placed in the circuit, consequently the coil iswound to a fraction of an ohm. But a voltmeter is alwaysjoined as a ^liunt to the circuit Avhere a measurement isdesired, and has a very high…
Telegraph
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