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 98
f a circle(Fig. 07), and equal lengths are marked off, then lines drawnfrom the centre to these points intersect the circumference. Now the tangent of an angle is ])roportional to the valueperpendicular^ .^ ^^^^, ^^^^ .^ .^ A2^ ^^^. ^^^3 A3 ^^^^^ ^^ ^^^_ base A(J AC, The particular length marked… … Fid. 68.—The tangent galvanometer scales. circumference. The number of such divisions indicated bythe pointer represent proportonal current strengths. The sensitiveness of the needle is varied by using asmall curved bar magnet fitted on a stalk so as to beabove the needle. When the similar poles of…
Telegraph
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