. Bulletin. s far as Hazel Avenue, Wilkes-Barre. The beds dipinto the basin at angles of 8° to 60° and in places are considerablycrushed. There were only a few breasts being worked at the time,and these were at the points shown in Plate III. The air enters themine at No. 3 shaft; part of it goes directly to the Abbott workingsand part indirectly through gangways and tunnels in other volume of the return air of the two airways at the time of sam-pling was 117,096 cubic feet a minute. The proportion of methanewas per cent in one airway and per cent in the other, indi-cating a
. Bulletin. s far as Hazel Avenue, Wilkes-Barre. The beds dipinto the basin at angles of 8° to 60° and in places are considerablycrushed. There were only a few breasts being worked at the time,and these were at the points shown in Plate III. The air enters themine at No. 3 shaft; part of it goes directly to the Abbott workingsand part indirectly through gangways and tunnels in other volume of the return air of the two airways at the time of sam-pling was 117,096 cubic feet a minute. The proportion of methanewas per cent in one airway and per cent in the other, indi-cating a total volume of 501 cubic feet of methane a minute. Thelength of coal exposed in passageways and chambers in the Abbottworkings ventilated by this air was 46,000 feet and as the averageheight is 6 feet the total area of coal exposed was 276,000 squarefeet. A calculation from these figures gives cubic feet of methanea minute for each 1,000 square feet of coal exposed. BUREAU OF MINES BULLETIN 72 PLATE I. MAP OF PART OF WORKINGS IN ABBOTT BED, SOUTH WILKES-BARRE MINE, PA. GAS IN NORTHERN PENNSYLVANIA ANTHRACITE FIELD. 125 The air represented by sample 1214 entered the mine at the No. 3shaft, passed along some Hillman and Kidney gangways and thenthrough No. 17 tunnel to the point designated A in Plate III, whereit was split to ventilate seven working faces in the deep basin lyingnorth of the shaft. These workings extend east for about 1,300 feetto the point where the sample was taken, and were only moderatelygaseous. The air current measured 21,175 cubic feet a minute andcontained per cent methane, or 68 cubic feet a minute. Asabout 66,000 square feet was exposed in the workings ventilated,slightly more than 1 cubic foot of methane to 1,000 square feet ofcoal is indicated. A sample of this air taken by H. I. Smith in February, 1912, inNo. 17 tunnel east of station 866 contained per cent ofmethane. The air volume was 6,200 feet and its methane contentwas 51 cubic fe
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