Mining, in a Nutshell

Mining, in a Nutshell

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...adjacent places and then report to me. I would instruct them how to mine and sprag their coal and drill their holes for shooting. Special attention-must be paid to pillar work on aocourrt of the extra danger, falls to be made, extra timbering, getting the coal out as clean as possible, getting practical men on them, keeping the iraoture line in shape, gas to be met with, ventilation, drainage, gas-feeders being left burning and coal dust accumulations. Height of Flame Cap The return air from a gaseous mine s-hows a mixture of 25 of air to 1 of marsh gas. Wlhat effect will this have on the flame of a safety lamp when testing it? 'Ilhat would greatly depend upon the make of lamp, tlhe kind of oil in the lamp and the size of the lamp flame. An ordinary clanny safety lamp, -burning seal oil and with a small "lamp flame there would be a small blue cap spindle-shaped formed on top of the lamp flame, this is called a-gas cap. The cap would be about three-fourtths of an inch in-height.-By cubing the amount of air and dividing into 94-O00 gives the height of the cap in eigihths of an inch. 25=15625. 94000+15625:6. This is 6-8 or 3-4 of an inoh of a cap. Hiring Workmen Before hiring a workman in any capacity what questions would you ask-him before giving him employment? If he had a mine foreman's or fire boss' certificate. Where he ha-d worked, what he had been doing. How long he had worked in the mines. What was the-cause of his leaving his last place. If-he ever worked with safety lamps. If he ever worked in headings or on pillars. If he ever worked where explosive gas was generated. Ilf he knew the dangers pertaining to gas and coal dust. If he had any experience in firing shots. What experience he had as a hauler, road, ...show more

Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236909348
  • 9781236909343