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 798
ing the gates. In this plan there is only one distant signal, No. 11, for the main down and branch down lines. Normally, all signals are set at danger, the switches are opened, the main lines unbroken, and thegates closed against the roadway traffic. In this position nothing interferes with the… … roe SIGNALS, RAILROAD. sequence of the switches being open. A movement of any of the levers will now produce locking andunlocking of other levers. The different cases are as follows : a. Moving to safety of the signal No.9 locks the lever No. 7 in its normal position, preventing the switch from…
Mechanical engineering -- Dictionaries
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