Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 880
d that the noise which always accom-panies a moving t.»ain prevented a distinct under-standing of the signals. A relay was, therefore,necessary, the principal requirements of whichwere two-fold. In the first place a very deli-cate relay was required for the reception of thevery weak induced… … Fig. 32.—Train telegraph etation.
Mechanical engineering
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