Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 24
ss frame insuch a manner that the movements of that leverseparate or unite them, opening and closing thelocalcircuit. The Sounder. What is the sounder — The instrument em-ployed in receiving messages. MANUAL OF TELEGEAPHY. . 21 Of what does the sounder consist—Simply two iipriglit electro-mag-nets,… … Fig. 12. The Sounder. la ted by two adjusting devices, one stopping themovement toward the magnets which gives thesound, the otherlimiting the move-ment of the leveraway from themagnet by thespring. Resonators. Resonators areused by all largecommercial offices,as the sounderincased in themgreatly…
Telegraph
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