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 129

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 129 — mean propor-tional number, fuch a fmall matter ex-ceeding 1, as but now mentioned ; andthis logarithm being as ofiep doubled asthe number of mean proportionals,(formed to get that number) will be thelogarithm of the given number. Andthis was the method Mr. Briggs took tomake the logarithms. But if… … rffirp .•■«//> LOG [ 1961 thing, to extraft the ir5._-^7-:th rootof 10. Now having the logarithms of3, j, and 7, they eafily got thofe of 2, 4,6, 8 and 9 ; for fince •*-£ — lf the loga-rithm of % will be the difference of thelogarithms of 10 and 5 ; the logarithmof 4 will be two times the…

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