A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)
Brande, William Thomas, 1788-1866, Cauvin, Joseph · New York : Harper & brothers · leaf 510
ated ; and in the coal meas-ures at Little Haven, St. Brides Bay (Pembrokeshire), wehave a gqod instance of their occasional contortions. The annexed diagrams represent a section of a coal basinand the disturbance and dislocation of the strata by dikesor cross-courses: A A, in the first figure, are… … Though there may be many beds and seams of coal in onefield, it is seldom that many of them are worked; they aregenerally of uniform thickness through a great extent, butare sometimes subject to irregularities. When less than twofeet thick, they are seldom worked to any great extent. The nature of…
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