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A coal filler at Nelson Colliery, Northumberland, was filling on an advancing longwall gateway face in a seam four feet thick and machine-undercut to a depth of 4 ft. 6 in. when a stone 8 ft. long, 3 ft. wide at the bottom, 1 ft. at the top, and 1 ft. 2 in. thick, fell from the wet blue shale roof. The fall disclosed inherent slips on the goaf side and one end, an induced break at the coal edge and a smooth parting above. He was apparently setting a wood plank and two others were broken. The broken planks had been set at right angles to, and notched into, the solid coal face and each was stated to have been supported with three props.
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