Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
It was assumed that shafts in which buckets are used would not exceed 300 ft in depth and that not over 60 tons of rock would be hoisted in 14 hr; in design of larger head frames, hoisting capacity of about 250 tons per 6 hr from depth of 300 to 500 ft was assumed; hoisting speed, rate of acceleration, and weight of rope have been ignored.
It was assumed that shafts in which buckets are used would not exceed 300 ft in depth and that not over 60 tons of rock would be hoisted in 14 hr; in design of larger head frames, hoisting capacity of about 250 tons per 6 hr from depth of 300 to 500 ft was assumed; hoisting speed, rate of acceleration, and weight of rope have been ignored.
Design of small wooden head frames
U S Bur Mines -- Information Cir
Staley, W.W. (Autor:in)
1937
37 pages
Supp plates
Report
Englisch
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