. Bulletin . er 119, Bureau of Mines, 1915,30 pp. ; Explosibility of gases from mine fires: Tech. Paper 134, Bureau of Mines, 1916, 31pp.; The explosibility of acetylene: Tech. Paper 112, Bui-eau of Mines, 1915, 15 ,. G. A., and Robertson, I. W., Effects of temperature and pressure on the ex-plosibility of methane-air mixtures: Tech. Paper 121, Bureau of Mines, 1916, 14 , G. A., and Gauger, A. W., Limits of complete inflammability of mixtures ofmine gases and of industrial gases with air: Tech. Paper 150, Bureau of Mines, 1917,13 pp. COLLECTION OF SAMPLES OF MINE GASES 3 fo
. Bulletin . er 119, Bureau of Mines, 1915,30 pp. ; Explosibility of gases from mine fires: Tech. Paper 134, Bureau of Mines, 1916, 31pp.; The explosibility of acetylene: Tech. Paper 112, Bui-eau of Mines, 1915, 15 ,. G. A., and Robertson, I. W., Effects of temperature and pressure on the ex-plosibility of methane-air mixtures: Tech. Paper 121, Bureau of Mines, 1916, 14 , G. A., and Gauger, A. W., Limits of complete inflammability of mixtures ofmine gases and of industrial gases with air: Tech. Paper 150, Bureau of Mines, 1917,13 pp. COLLECTION OF SAMPLES OF MINE GASES 3 for shipment to engineers in the field. The shipping containers arewooden boxes (11 by 7^ by 4i/^ inches, outside measurement) whichhave two compartments lined with corrugated paper board to mini-mize the possibility of breakage during shipment, and are of a size tobe shipi^ed bj parcel post. Figure 1 shows a box containing twovacuum bulbs. When the samples have been taken the bulbs arewrapped in paper so as to. fit snugly in the compart-ments, and more paper ispacked around the compartment containsa form card on which in-formation can be directions forsampling gases by thevacuum-bulb method cannot be given to fit all cir-cumstances, because of themany varying conditionsencoimtered in differentmines or even in differentparts of the same must be understood thatthe vacuum bulb takes asample of gas at one pointonly—where the tip of thebulb is broken off. Thiscondition largely limits itsuse to these places wherethere is enough air move-ment to make the composition of the gases uniform across a givencross section in a return airway or entry. Figure 1.—Shipping box containing vacmini bulbs SAMPLING AVHERE THERE IS APPRECIABLE AIR MOVEMENT To sample where there is appreciable air movement, stand facingthe direction of air movement—^that is, with the air blowing againstthe face—and hold the vacuum bulb, with arms outstretched (toprevent contamina
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
