The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 329
, by Mr. Dunn, ofNewcastle-on-Tyne, the first attempt in Ireland. The colliery containstwo principal seams of coal, lying at an angle of one in three. Theupper one, lying at the depth of 22 fathoms, is exhausted; aixi inorder to win the second seam, at the depth of 30 fathoms farther, thewaters of… … point of discharge by tubbing. In order to give this project a fairchance, a piece of fire-clay, lying below the first seam, was taken ad-vantage of as a foundation, and the shaft was rounded out to ten feetdiameter. The base of tubbing is made to rest upon a pair of oakencribs, fitted closely to…
Architecture · Civil engineering · Science
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