At one of shipyards in British Columbia large timber derricks are employed for placing steel and machinery in ships; booms are 16 × 16-in. timbers 90 ft long; they swing through arc of 220° and each boom is capable of handling load of 10 tons at radius of 42 ft.
Timber derricks for shipyard use
Eng News-Rec
Engineering News-Record ; 130 , n 20
1943
2 pages
Article (Journal)
English
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