Transactions . CAS IN THE SOLID COAL.—HETTON. 1G<J The experiment was made in the Hutton Seam at a point about 3,530yards due east from the shaft and about 100 yards from some old goaf,the dip of the strata being towards the east. The roof is composed of grey metal with post girdles, and is mode-rately good. The thill is of rather soft seggar clay. The coal is clear, hard, and bituminous, with the cleavage well defined,and is used for household purposes. None of the coal seams, either above or below, have been worked. The specific gravity is 1*17. On September 1st a hole was bored in the so
Transactions . CAS IN THE SOLID COAL.—HETTON. 1G<J The experiment was made in the Hutton Seam at a point about 3,530yards due east from the shaft and about 100 yards from some old goaf,the dip of the strata being towards the east. The roof is composed of grey metal with post girdles, and is mode-rately good. The thill is of rather soft seggar clay. The coal is clear, hard, and bituminous, with the cleavage well defined,and is used for household purposes. None of the coal seams, either above or below, have been worked. The specific gravity is 1*17. On September 1st a hole was bored in the solid coal at the face of awinning headways, on the dip side of a 7-feet trouble. See Section No. 2. Skotion No. CONDITIONS. The length of the borehole was ... The diameter of „ The diameter of pipe fixed in the hole Gas space ... The hole parallel with the cleat. Cover—depth of hole from surface Distance of hole from shaft Description of gauge Ft. In. 9 021 ... 2 0 1,228 ,530 The hole was made tight in the same way as in Experiment No. 1,except that only one foot of India-rubber washers was used ; these washerswere screwed up and expanded so as to completely fill the hole, theouter end being filled up with Portland cement. See Section No. 2. Lbs. per sq. inch. 170 EXPERIMENTS SHOWING THE PRESSURE OF RESULTS.—See Table, Page 226. Sept. 1.—At 10 the gauge was screwed on, and thereadings were noted every hour. In five Pressure of Gas. minutes the pressure was ... 8| „ At 11 „ 29 Sept. 2.—At 5 , the pressure was 40 Up to this time a steady increase went on, whichwas followed by an equally steady decrease. „ At 6 the pressure was 39| R
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