A new and complete dictionary of arts and sciences : comprehending all the branches of useful knowledge, with accurate descriptions as well of the various machines, instruments, tools, figures, and schemes necessary for illustrating them, as of the classes, kinds, preparations, and uses of natural productions, whether animals, vegetables, minerals, fossils, or fluids : together with the kingdoms, provinces, cities, towns, and other remarkable places throughout the world : illustrated with above three hundred copper-plates, engraved by Mr. Jefferys, geographer to His Majesty : the whole extracted from the best authors in all languages (1763)
Society of Arts (Great Britain). Society of Gentlemen, Jefferys, Thomas, -1771, Grignion, Charles, 1721-1810, Wale, Samuel, d. 1786, Owen, W. (William), d. 1793 · London : Printed for W. Owen, at Homer's Head, in Fleet-Street · leaf 905
will not fuffer the valve to rife till the IprefTure there be greater within than with- jout, which it cannot be till the furfacepf mercury in the outer leg M S be higherthan that in the inner one; wherefore, jbefore the valve E can open, the mercury \in each leg mult come again to the levela, £5… … <. Ay/rry, .<,;,/,, PUM [ 2645 ] PUM leg ; fuppcfing the mercury now ftandsat e in that, and at/ in the other: andthen the (aid height of the water will benearly 14 times the height df, or ce.All this is very eafy to underftand fromthe common principles of bydroftatics ;and if this be…
Art · Science
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