Bulletin . ence of a small percentage of gas will APPLICATION OF STONE DUST IN BRITISH MINES. The earliest experiments with stone dust in the Altofts galleryhaving, in the opinion of the committee, given unmistakable indi-cations of its possible value, the management of the Altofts collierywas asked to try its use in the mine to ascertain the cost of application. The first scheme adopted was to isolate various parts of the mineby stone-dust zones 600 feet in length. Further consideration ledto the abandonment of zones and the institution of the principle ofscattering stone dust whereve
Bulletin . ence of a small percentage of gas will APPLICATION OF STONE DUST IN BRITISH MINES. The earliest experiments with stone dust in the Altofts galleryhaving, in the opinion of the committee, given unmistakable indi-cations of its possible value, the management of the Altofts collierywas asked to try its use in the mine to ascertain the cost of application. The first scheme adopted was to isolate various parts of the mineby stone-dust zones 600 feet in length. Further consideration ledto the abandonment of zones and the institution of the principle ofscattering stone dust wherever there was coal dust. The stone dust is obtained from the roof material, a shale, winchis ground fine and applied dry. Plate VII shows part of the wall in its natural condition, the otherpart treated with stone dust. The Altofts management state thatstone dust by reason of its greater density displaces the coal dust on a Record of the first series (1908-9, Of the British coal-dust experiments, pp. T# \l Mft
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
