Practical Coal Mining: A Manual for Managers, Under-managers, Colliery ... by George L. Kerr

Author:George L. Kerr
Language: eng
Format: epub
Publisher: C. Griffin & Company
Published: 1905-03-25T05:00:00+00:00

Fles. 269, 270, 271.—Hatbod of laying railB.

being cheap and light, while the cost of maintenance and repair b less than for steel, and less skilled, i.e. cheaper labour is required for constructing and repairing wooden than for iron or steel tubs. Again, it not infrequently happens that even in the best regulated oollieries a train of tutn breaks away on inclined haulage roads, and when such an accident takes place, the tubs will be more or less smashed and broken. It made of wood they can soon be repaired, even although they may be badly damaged, whereas if constructed of wrought iron or steel they would be so twisted and

rEACnCAL COAL-MININQ.

bent that the work of a skilled blacksmith would be required tor their repair. Id thick seaoiB lying at a comparatively amall iticliuatioD, iron or steel tubs are preferable, especially if the load is targe (20 to 40 cwts.)-

Figs. 272, 273, 274 show the oonstruotioa of a tub designed by the author and built of wood. The framework is made of two ' tnms' of larch wood 4 J in. x 3} in., held together by oak ' starts' 3^ in. xl^ in., and further strengthened by two iron rods 1 in. diameter. The body is of larch cleading IJ in. thick, bound at

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