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Scientific American, Vol. 57, No. 12 (1887) (1887)
leaf 3
ment with the projection attached to the railing, trains passing a crossing at the same time, or witha when the weight acts to return the gates to closed po- train backing down on acrossing after it has passed, sition, this cord also serving to enable the engineer or the signal and the gate… … tar and pitch when soft, © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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