Considerations on the medicinal use of factitious airs and on the manner of obtaining them / [Thomas Beddoes].

  • Thomas Beddoes
Date:
[1794?]-1796
Catalogue details

Licence: Public Domain Mark

Credit: Considerations on the medicinal use of factitious airs and on the manner of obtaining them / [Thomas Beddoes]. Source: Wellcome Collection.

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    ( 24°) , Sept. 27th, 1794. -DEPHLOGISTICATED AIR FROM MANGANESE BY HEAT. . Having obtained a {mall quantity of Exeter Manga nefe, fince the preceding .papers were printed, 1 am enabled to give fome direétions concerning the procefs for extricating the air from it by mere heat.—The man- ganefe, reduced to a coarfe powder, is to be put into the pot or the fire tube;-which are then to be placed in the furnace ; and the joints with the capital or end pieces carefully made with the cement of China clay, or quick lime moiftened with faturated folution of borax.—The reft of the apparatus is then to be put together, and the joints of the conduéting pipe with the refrigeratory, and of the refrigeratory with the bellows, to be made good with a part of China clay, or whiting, mixed with flour and water, and for: farther fecurity a rag bound round them.— When this is done, the fire is to be lighted, and no more air admitted than will permit it to burn very gently ; fora very moderate heat is fufficient for difen- gaging the air.—When the cement of the joints near the fire is dried, they ought to be covered over with the fat lute of lintfeed oil and flaked lime, and when that _ hiquifies by the heat, a little dry lime may be applied to it to prevent its running off.—The hole for the water- pipe may either be flopped with a plug, or with the water-pipe itfelf, which in that cafe fhould be filled with water, merely to infure its being air tight; for it. does not feem neceffary to admit water in this procefs, though it feemed rather to accelerate the extrication, itdid not appear to increafe the quantity of the air.—A pound of the hard part of the Exeter manganefe yields about 140@ _ cubic inches of air, which appeared highly dephlogitti- cated, by its a€tion on the flame of a candle, and free from any tafte or {mell of fixed air ; (I did not fubmit it to other tefts ; the hate of my health does not permit me to make experiments with nitrous air.) The foft clay- like part of this manganefe does not, yield, fo, much air, but what it vields is equally pure.—I had imagined. that the fire-tube might be emptied, and, frefh manganefe put in, without removing the tube from the fire, but ] find, ; that
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