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 81
was last placed /VWVN/^ ^ VWVVV WP I , I 1 DDI Fin. 13.—.Micliaiiioal bias of Staudanl Ufulr;i (by current or the hand), but in the standard neutral relaya central position of the tongue is obtained by meclianicalmeans. In one pattern Iwo helical s]n-ings act on opposite 70 ELEMENTARY TELEGRAPHY… … ;,«:%i.. Fii.-. 44. —Xi>ii-iiolarized rel;i,v B. A von-polarized rela} in appearance like the standardrelay is shown in Fig. 44. Its two soft iron armatures arein two sections brazed together with a layer of spelter tol)reak the magnetic circuit and assist in producing morerapid demagnetization.…
Telegraph
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