Transactions . VOL. 196 EXPERIMENTS SHOWING THE PRESSURE OF Plan No. 4, being an enlargement of a portion of Plan No. 3,showing the position of the holes bored for the first four EXPERIMENT I. On May 11th, 1880, a hole was bored in the solid coal at the face of anarrow board. See Plans Nos. 3 and 4, and Section No. 7. Section No. 7.

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Keywords: ., bookcentury1800, booksubjectmechan, booksubjectmineralindustries