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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 28

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 28
d vifible Horizontal fur*face, there are many woe imaginary) ytfreal.Figure i.O R the better undemanding; thefollowing Experiments 3 it isneedful to premit the fubfe-quentTheoremsjthefirft where-of is, that in all Fluid bodies,fuch asAir5Water5andMercury,or any other liquid , there is be-fides the… … QptyoHatfcal XDeomnSJ A BCD, there is a fecond E F G H, and a third IK LM,and fo downward, till you come to the bottom. Thisholds true, not only in Water, but in Air alfo , or in anyother Fluid body whatfoever, I call the under-furf acesimaginary, not becaufe they are not real 5 for true and…

Hydrostatics · Coal

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