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 216
en two carbon plates. The lower plates are fitted intinned brass holders connected to screw terminals, while theother carbon plates are held by spring clips joined to theearth-connected brass bar. Tci^ hoard.—From the fire-proof chamber the wires, withsilk and cotton flame-proof insidation, are… … Switch sj rin;^ tost loan ()[ the line connection are j()iiie<l 1)y their inner contactsto the inner contacts of the instrument s|)rings, and when 206 ELEMENTAUY TELEGRAPHY everything is iu order no connections usually apjDear on the face of the hoard. For special purjDoses, tests or crosses,…
Telegraph
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