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 53
42 ELEMENTAR Y TELEGRAPHY together, patent non-corrosive fittings are nsed, tlie metalbeing a s])ecial lead alloy wkicli is not affected by the acidor the evolved gases. The plates are kept from touchingeach other by long strips of ebonite or glass tubes, althoughthe most recent improvement is the… … Fui. 17.—Hart cells, T type. l)y the sulphitric acid or gases produced during charging ;they cover the surface of the plates and are used in con-junction with the existing separators, whether they be glasstubes or any other form. The positive plate is known as the Hart Demi-Planteplate, the grid…
Telegraph
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