Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 391
1571. WHARF CRANE, withtrussed arch jib. Pivoted to turn inany direction. Power shaft turns incrane pivot. 38o MISCELLANEOUS DEVICES. … 1572. AUTOMATIC BALANCE CRANK —The rocking base shifts the centre of gravity^ of load and balance weight. The crane andplatform revolve on radial rollers.
Mechanical movements
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