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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 86

An illustration from 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, leaf 86
nals, two line terminals cappedwith ebonite, and each half of the key can be used independ-ently if desired. As will be seen by reference to sketch(Fig. 52), the upward movement of the lever, caused bydepression of key, makes contact with the thin strip beforeit raises the latter from its normal… … Fii;. ill.—li-teniiiijal lexersing key. _) To Line LKEr LEVERTo + . To — Pole Of batTerf Fiii. >2.—Note : Wlieii key depressed -} tuline before - contact broken.

Telegraph

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