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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 85

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 85
uits. With a(ljusta])le contact screws, i)latiiiuiii con-tacts, mounted on an ebonite slab lixed on a j^olisliedmahogany base, tlie Doul)lo current Vex, five terminal, 74 ELEMENTARY TELEGBAPHY as it is called, is a most com-enient piece of apparatus ; ascan be seen from the diagrams (Fig. 50) the… … Firi. 50—Internal connections of 5-terminal key. (1) Snitch to send, leverat rest; (-2) switch to send, lever depre.ssed ; (3) switch to receive. vided with four battery terminals, two line terminals cappedwith ebonite, and each half of the key can be used independ-ently if desired. As will be seen…

Telegraph

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