Derrick used to set completely assembled 150-ft. trusses on California State Highway project; specifications required that continual operation of both railroad and county road be permitted; derrick was of structural-steel type with 46-ft. mast and 90-ft. boom with legs 50 ft. long.
Stiff-leg derrick places 150-ft. Trusses for highway bridge
Eng. News-Rec
Engineering News-Record ; 106 , n 20
1931
1 Fig.
Article (Journal)
English
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Welded highway bridge trusses of 150-ft. span
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Engineering Index Backfile | 1930
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Engineering Index Backfile | 1958
Engineering Index Backfile
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