Bulletin . ASPHALT-TREATED CANVAS PIPE VENTILATING A CANVAS PIPE UNDER PRESSURE TURNING A CORNER IN A TIMBERED DRIFT. SUMMARY. 103 over the exposed shaft timbers and gunited. Costs ran from $8or $10 to as high as $20 per linear foot of the three-compartmentshaft, which was 5 by 17 or 18 feet. Other experimental work was done often by Butte mining com-panies in cooperation with manufacturers. Tests showed that can-vas tubing had many advantages over galvanized pipe for blowingair to blind ends, using small direct-connected electric motors andblowers. The stock sizes of blowers, however,
Bulletin . ASPHALT-TREATED CANVAS PIPE VENTILATING A CANVAS PIPE UNDER PRESSURE TURNING A CORNER IN A TIMBERED DRIFT. SUMMARY. 103 over the exposed shaft timbers and gunited. Costs ran from $8or $10 to as high as $20 per linear foot of the three-compartmentshaft, which was 5 by 17 or 18 feet. Other experimental work was done often by Butte mining com-panies in cooperation with manufacturers. Tests showed that can-vas tubing had many advantages over galvanized pipe for blowingair to blind ends, using small direct-connected electric motors andblowers. The stock sizes of blowers, however, handled more air thanthe desired sizes of canvas pipe could transmit; by decreasing thewidth of stock sizes of small blowers to one-third or one-half or two-thirds smaller motors could be used to transmit the same quantityof air through the canvas tubing. By adopting the smaller motorsand blowers of less width the consumption of power was decreasedat least 30 per cent. Canvas pipe, though very flexible, had many disadvantages. Onedisadvantage was overcome
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
