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Search "Derrick"
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Derrick | |
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About 5 pages (1,612 words) in 2 products |
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Encyclopedia and Summary Information
summary from source:
 Derrick : Environmental Health Terms
27 words, approx. 1 pages A crane in which the lifting arm (the boom or jib) is steadied from the main supporting post or tower by an arrangement of guy... summary from source:
 Derrick Information
1,585 words, approx. 5 pages
A derrick is a lifting device composed of one mast or pole which is hinged freely at the bottom. It is controlled by (usually 4) lines powered by some such means as man-hauling or motors, so that the pole can move in all 4 directions. A line runs up it... 
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About 5 pages (1,612 words) in 2 products |
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