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 56

An illustration from 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, leaf 56 — e of re-fracting burning glades; the funs lightand heat being exceedingly augmented inthe focus cf a lens, whether convex orplano-convex ; (ince the rays falling pa-rallel to the axis of the lens are reducedinto a mtuh narrower compals, fo that• tis no wonder they burn fome bodies,melt others,… … ■lc 1**. B (i « A H^~ T • /<//<■ f/ <<<>//> LEN [ i9°3 1 LEN equally or unequally, the rays after re-flation become parallel. H?nceby meansof a convex lens, or a little glsfs bubblefull of water, a very intenfe light may beprojected to a vaft diftance.And this furnifhes us with…

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