A treatise on ore and stone mining

A treatise on ore and stone mining

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The steel shoes / /, attached to the bottom of the frame of the cage, will, if desired, rest upon the inclined faces b b of the keps. ... 481, the keps cannot open under the pressure of the load, because the pin t prevents any motion in a horizontal direction. ... It is necessary to have some means of communication between the various on-setting places and the top of the shaft, so that the man at the ... The cord is carried round curves and corners by means of cranks similar to those used foranbsp;...

Title:A treatise on ore and stone mining
Author: Clement le Neve Foster
Publisher: - 1905

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