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
Fig. 32.—Train telegraph etation. … The relay. 850 TELEGRAPH. relay designed by Mr. Phelps, and which is represented in Fig. 33. It will be scon to consistof two steel magnets, bent as shown, with their like poles brought together and carrying anextension piece which has a V-shaped groove at the top. The other ends of the…
Mechanical engineering
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