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 560

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 560 — lafs of an hundted feet foculwill admit of an eye-glafs af little moithan fix inch focus, and will thercfoimagnify almoft zoo times.The reafon of th:s difpropction, in thdfevcrtl degrees of magnifying, is to Iexplained in the following mannedfince the diameters of the fp*ces, inlwhich rays flowing… … tJlftrfhpiMH&t, T E L [ 3i73 ] TEL the degree of confufednefs will only beas the diameters or bread.lis of thofefpaces, and not as the fpaces themfelves.)Now the focal length of the eye-glafs,that is, its power of magnifying, multbe as that degree 5 for, if it exceeds ir, itwill render the…

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