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 175
f the other bar as before directed, andJgo over that in the fame manner; then!turn both the bars the other fide upwards,!and repeat the former operation: thisbeing done, take the two from between!the pieces of iron, and placing the twojoutermoft of the touching bars in theirroom, let the other two… … •/;/■■//■/ •r// MAG [ 1999 3 MAG over, which will give them a confider-able magnetic power, put the half dozentogether after the manner of the four,(ibid. fig. 3.) and touch with them twopair of the hard bars placed between theirirons, at the diftance of about half aninch from each other ; then lay…
Art · Science
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