Observations on the nature and properties of fixible air : and on the salutary effects of the aqua salubris, in preserving health, and preventing diseases : to which are added, strictures on the present practice of physic, pointing out the causes which greatly obstruct the improvement of the healing art / By John Melvill.
- Melvill, John.
- Date:
- [1787]
Licence: Public Domain Mark
Credit: Observations on the nature and properties of fixible air : and on the salutary effects of the aqua salubris, in preserving health, and preventing diseases : to which are added, strictures on the present practice of physic, pointing out the causes which greatly obstruct the improvement of the healing art / By John Melvill. Source: Wellcome Collection.
Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.
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![tlyree times in the courfe of fixtecn or twenty hours, the water will be fijfficiently impreg-. nated without agitotioi-i The marble powder is ♦ I prefer this method, as there is much lefs danger in bufiling the glaffes. Here I fliall prefent my readers v/itk Dr. Prieftley's method, which, though not fo convenient and cleanly as the glafs apparatus, neverthelefs maybe very ufeful to thofe who cannot procure glallesj or who find them too expenfive. PREPARATION. Take a glafs veflel, <?, plate 2, fig. i,with a gretty narrow Beck, but fo formed, that it will ftand upright with its Baattth downwards, and having filled it with water, lay a flip of clean paper or thin pafteboard upon it; then, if they be preffed clofe together, the veflel may be turned upfide diowB, without danger of admitting common air into it; arid wiien it is thus inverted, i,t mufl: be placed in another Teffef,, in the form of a bowl or bafon, />, with a little water in it> fo. much as to permit the flip of paper or paftcboard to be withdrawn, and the end of the pipe, to be intro- cEu^red.. This pipe muft be flexible, and air tight, for -wrbich purpofe it is, I believe, belt made of leather, fowed ■with 2 waxed-'thread, in the manner ufed by fhoemakcrs ; into both ends of this pipe a piece of quill fhould be thruft, ?a keep them open, while one of them is introduced into a veflel of water; and the other in the bladder, ^, to the op- pc^te- end of which is tied round a cork, v^rhich muft be perforated, tlie bole kept open by a quill, and the cofk jn:tift fit a pliial, f, two thirds of v/hich fhould be filled with <^^al]b. juft covered with water. I have fince, however, found](https://iiif.wellcomecollection.org/image/b21483188_0032.jp2/full/800%2C/0/default.jpg)
