Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in construcive and operative mechinery and the mechanical arts, being practically a mechanical dictionary (1917)
Hiscox, Gardner Dexter, 1822?-1908 · New York : The Norman W. Henley publishing co. · leaf 361
i? 1469. PORTABLE STEAM DERRICK,on swivelled platform, balanced by boiler. … 1470. SWING-BOOM CRANE, with atravelling truck and trolley lift. Boom re-volving on radial rollers.
Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.