Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 146
ASSOCIATION OF ENGINEERING SOCIETIES. 116 If the coal is very soft and friable, the bucket may be lowered to the coal pile before emptying, giving no appreciable fall to the coal. With ordinary coals this precaution is not necessary. … Grab Bucket Open. It will be noticed that the center K of the pivot shaft is above the center with which the wings are struck. This gives a scooping motion to the bucket when closing, causing it to bury itself well into the coal.
Engineering
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