Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 237
88oa. AIR SHIP.—General form of those inuse that have had any suc-cess. Too many come togrief and they should be awarning to the ambitioussoarer, to learn what hispredecessors have done. S8ob. RAILROAD GATE operated by com-pressed air.—A hand pump in the gate housecompresses air which is… … SSoc. RAILROAD CROSSING GATE.—A lever in the gatehouse operates the gate arms by a series of bell cranks linked to-gether and to sectors in the gate arm boxes. A small lever andsector at each arm to close the foot walk. NAVIGATION AND ROADS. 227
Mechanical movements
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