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 45
s made into a paste Avith some absorbent sub-stance. As a rule the positive plate forms the case of thecell Avith the carbon rod in the centre surrounded by adamp black paste of carbon and manganese, and also, insome patterns, salts of iron, magnesium, silicon, etc. Themake-up of the various dry… … Fii;. H.—Leclancheagglomerate. PRIMARY BATTERIES 35 molten alloy, composed of Lismiitli, lead and tin is pouredaround tlie pin. Tliis alloy expands slightly in coolingand a perfect contact between the pni and the carbon ismade. Dj-y cells are very portable, but deteriorate whenstored, particularly…
Telegraph
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