American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 425
ome of the blowswould op[)ose its motion and it would practically come to a standstill. In Grays harmonic telegraph system this general principle is employed. Thetheory of this ingenious system is shown in diagram, Fig. 268Z>. f\ f^, f^, F%.arecircuit-breaking foiks, fastened at one end x^ which… … they open and close the circuits of their respective main batteries at a rate corre-sponding with their fundamental rate of vibration. These forks are kept in constantvibration by well-known electromagnetic vibrating devices not shown in the figure{i<ee pages 257, 272, 2)2)^^ 357)5 while the…
Telegraph
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