Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 805
the train has entered thesucceeding section and passesover track instrument No. 2,closing a circuit. As this in-strument connects with thesafety signal by means of itsconnector 2, a circuit will beclosed which runs from theground through track instru-ment No. 2, the safety signal,its connector 2,…
Mechanical engineering -- Dictionaries
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