. An Account of the Magnetical Machine Contrived by the Late Dr. Gowin Knight, F. R. S. and Presented to The Royal Society, by John Fothergill, M. D. F. R. S. . 4 I%^\ VoiJ-XV. TabMl/^t;^/. Dr. KNiGHT^s Magnetical Machine. 597 EXPLANATION OF THE PLATE. Plate VII. fhewsthe magazines according to the doctorslaft difpofition of them. The two being perfe<5tly alike^therefore fig. 2. contains only the half of one of magazine confifts of 240 bars, difpofed in fourlengths, marked i. 2. 3. 4.; every length containingiixty bars, placed in fix courfes or layers, in conta6t oneon a
. An Account of the Magnetical Machine Contrived by the Late Dr. Gowin Knight, F. R. S. and Presented to The Royal Society, by John Fothergill, M. D. F. R. S. . 4 I%^\ VoiJ-XV. TabMl/^t;^/. Dr. KNiGHT^s Magnetical Machine. 597 EXPLANATION OF THE PLATE. Plate VII. fhewsthe magazines according to the doctorslaft difpofition of them. The two being perfe<5tly alike^therefore fig. 2. contains only the half of one of magazine confifts of 240 bars, difpofed in fourlengths, marked i. 2. 3. 4.; every length containingiixty bars, placed in fix courfes or layers, in conta6t oneon another; and ten in each courfe, placed fide by fide,in conta£t alfo. The bars being very nearly of a fize,the ends of thofe in one length are in contact with thecorrefponding ends of thofe in the adjacent lengths*The magnetical North-ends of thefe bars, in each maga-zine, are all directed one way towards n ; and the South-ends the contrary way toward s; thick plates of ironcover thefe ends n and s; the junction of the ends of thebars fall under the brafs braces aa. As it has been found difficult, after the final harden-ing of thefe bars, to preferve among them a perfectequality in fize; ther
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