. 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. . polesbe altered, though it was placed between two of his largeftbars, and they were very ftrongly impregnated. Themafs, was not very heavy, and had miJich the appearanceof a piece of black lead, though not quite fo fliining. Ibelieve he never divulged the compofition; but, I think,he once told me, the bafis of it was filings of iron, re-duced by long-continued attrition with water to a per^fe<ftly impalpable ftate, and then incorpor
. 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. . polesbe altered, though it was placed between two of his largeftbars, and they were very ftrongly impregnated. Themafs, was not very heavy, and had miJich the appearanceof a piece of black lead, though not quite fo fliining. Ibelieve he never divulged the compofition; but, I think,he once told me, the bafis of it was filings of iron, re-duced by long-continued attrition with water to a per^fe<ftly impalpable ftate, and then incorporated with fomepliant matter, to give it due confiftence. Perhaps fome ofhis acquaintance may have been more fully informed ofthis circumftance; and it may be rendering great aid tofuture enquirers, to know every thing that can be col-lected relative to fo curious a fubjedt. Left the machine itfelf fliould aigain be expofed to alike accident with that which deftroyed a part of it, Ithought an exa6l reprefentation of it, and its feveralparts, might be the beft means of preferving it to futuretimes, if inferted in theTranfadtions of the Royal Society. E X-. I*h4liphiltrans07482774
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