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 591
ching furfaces lie perfectlyfmooth. a. But fince we find no fuchthing as perfect fmoothnefsin the furfacesof bodies, but an evident roughnefs orunevennefs of the parts in their furface,arifing from their porofity and peculiartexture, it is eafy to understand that whentwo fuch furfaces come… … F R 1 [ 1349 1 F R I tiori is attempted in one, the fixed pro-minent parts of the other will give moreor lefs refinance to the moving furface,hy holding and detaining its parts; andthis is what we call friclion, 3. Nowfince any body will require a force pro-portional to its weight to draw it over…
Art · Science
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