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Scientific American, Vol. 63, No. 12 (1890) (1890)
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eth are adapted to be alter- nately engaged on each forward and backward move- 0 C pman ht) Row a | yy AN IMPROVED LIFTING TRUSS GIRDER. ment of the frame by the teeth of a segmental wheel re | BPN ne The illustration represents a contrivance by means secured on a transverse shaft, having a fly… … tons, and last year 4,717,780 tons. HAYTON’S MECHANICAL MOVEMENT. © 1890 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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