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The hydrostaticks; : or, The weight, force, and pressure of fluid bodies made evident by physical, and sensible experiments, together with some miscellany observations, the last whereof is a short history of coal, and of all the common and proper accidents thereof, a subject never treated of before. (1672)

Sinclair, George, d. 1696 · Edinburgh : Printed by George Swintoun, James Glen, and Thomas Brown · leaf 289

An illustration from The hydrostaticks; : or, The weight, force, and pressure of fluid bodies made evident by physical, and sensible experiments, together with some miscellany observations, the last whereof is a short history of coal, and of all the common and proper accidents thereof, a subject never treated of before., 1672, leaf 289
Thenext, they call Uinging-coal, The laft is called Edge-Coal. The firft is the moft profitable , in regard, thatits long before the Coal-hewerscan reach the Croppy andconfequently the more of it is workable. The fecond andthird fort, are fometimes of their own nature, more firm,and fitter for… … C D f n all the three Figures, the point B is the Croff of theCoal, The Line B C is the body of the Coal decliningor the Dipf from the Cropp. AC is the perpendicular,falling from the Horizontal Line, whereby the true decli-nation or Dipp of the Coal is folind. So that after you havefound your Coal…

Hydrostatics · Coal

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