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 90
{A and B,Fig. 58) separated by boxwood or ebonite. To .1 thenegative j)ole of the battery is joined, while the positive TELEGRAPH INtiTRVMENTS 79 pole is connected to /). /S and Nj are two steel springseach in connection ^vitll the brass pieces h and /jj, and thesprings are normally in contact by… … Fig. 5,!.—Connections olsingle neeille, left-hand lajiper depiussed. and h]. A metal pin, p, is fixed on A, and a similarprojection 2^1 is fitted beneath B. When the lumdle is atrest these projections remain between the springs andbrass pieces without touching either. The effect of themovement of…
Telegraph
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