New all welded frame of 8 1/2 ton trolley for ore bridge produced by Dravo corp, Pittsburgh, weighs 36% less than original 5-ton trolley with riveted frame; new bucket holds 123 cu ft as compared with 80 cu ft capacity of old bucket; lighter weight girders employed; weight saving of 47% made possible by welded drums; welding operations described. (See also Welding Engr v 39 n 7 July 1954 p 28-30, 44)
Three tons more payload
Can Machy
Canadian Machinery ; 65 , n 7
1954
4 pages
Article (Journal)
English
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