An Essay on Fire. to Which Is Added, an Appendix. by C. R. Hopson, M.D

An Essay on Fire. to Which Is Added, an Appendix. by C. R. Hopson, M.D

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1781 edition. Excerpt: ...of the nitrous or any other acid, yield a considerable Mr. Schcele, by rejecting the interposition of sire in these and similar operations, and setting up beat as tho F 2 S"11 grand agent in its stead, has involved himself and his subject in unsurmountable difficulties, and has particularly drawn upon himself the just censures of Mr. Kirwan, his English commentator; who argues, that on this supposition metallic calces in general, or at least black manganese must be reduced by bare heat, which neither Mr. Schecle nor any one else will assert. But is Mr. Kirwan himself much happier in his explanation of this difficult theorem, when he fays, that "the air being dephlogisticated "attracts the elementary sire in the calces, which is neces. "sary to its existence, that is, to the existence of the de' phlogisticated air." Does this air then, like the animal and vegetable kingdom, require a pabulum? Nothing surely can exceed this instance of attachment to system, except, perhaps, the remarkable conduct of Mr. Scheele in persisting throughout his whole book, to deny ihe efficacy of Hghtin the separation ofairfrom, and the consequent reduction of metallic bodies; when, at the fame time, his great love of truth obliges liim, in every instance but one, to assure us, that the salt or metallic body, or at least the bottom of the retort containing it was made red hot. Ii this one experiment indeed he affirms, that the nitrous acid was decomposed before the retort was red hot. Exp. 3. Sect. 34. But this being a single and singular instance, was probably a deception. How rare are such instances of candour in systematic writers I quantity quantity of the purest air. The chief of these are calcined mercury and minium. But neither do these, more

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  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236538668
  • 9781236538666