Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 238
p in the gate housecompresses air which is transmitted to pistons atthe gate bar posts by double pipes so that thebars are raised or closed by the air valves in thegate house. The air pump is located in the gatehouse. wwt^^g^gljS^^^^jaipt^w^iita^ygf/^;^^ 880c. RAILROAD CROSSING GATE.—A lever in the…
Mechanical movements
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