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 117
ease witli 106 ELEMENTARY TELEGRAPHY the terminals mounted on an ebonite strip. Tliis is nsitallytermed a metal case resistance and the values of the coilsare chosen to provide a protective resistance in certain uni-versal battery leads, as will be explained in that section.Jhe metal case promotes… … Fk;. S4.—riaii of rheostat C brass case, has two contact arms arranged so tliat eachmoves over one half of the contact studs. The ten coils ofone semi-circle are of 40 each, while the value of each coilin the other semi-circle is 400 and the maximum obtain-able by the arms is 4400. Three additional…
Telegraph
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