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 890
day thefuns rays will pais direclly through theperforation of the piece R, if it be putin a pofition parallel to the plane of the :ecliptic, or that of the clock ; and aliothat the top of the fhadow of the faidftyle will fall exaflly on the faid hole.Inthiscafethetopoftheflyleis at the… … T.ji/ptpi Jrtffrf HEL [ 1601 ] tion to the fecant cf the angle which therays make with this firft or middle ray, HEL that pafs by the top of the ftyle, andthrough the hole R. Now it may be demonftrated, that on anyday of the year, if the clock and its pe-deftal be fo fixed that the line of XII…
Art · Science
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