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 100
4). A mirror is phiced near each scale so that correct read- TELEGRAPH INSTRUMENTS 89 iuo- is insured by observing that the pointer obscures itsreflection. The horizontal galvanometer (Fig. 69) is most frequentlyused in connection with the Wheatstone Bridge. It has asingle flat coil with a small…
Telegraph
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