Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 162
559. WATER-VELOCITY INDICA-TOR AND REGISTER.—Variations invelocity of a stream varies the position ofthe float, which is registered on a traversecard by a pencil. … 560. ANCHORED FERRYBOAT.—One of the few methods of crossing a stream byH the action of the current
Mechanical movements
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