A treatise on electricity wherein its various phoenomena are accounted for, and the cause of the attraction and gravitation of solids, assigned : To which is added, a short account, how the electrical effluvia act upon the animal frame, and in what disorders the same may probably be applied with success, and in what not / By Francis Penrose.
- Penrose, Francis, 1718-1798.
- Date:
- 1752
Licence: Public Domain Mark
Credit: A treatise on electricity wherein its various phoenomena are accounted for, and the cause of the attraction and gravitation of solids, assigned : To which is added, a short account, how the electrical effluvia act upon the animal frame, and in what disorders the same may probably be applied with success, and in what not / By Francis Penrose. Source: Wellcome Collection.
12/40 (page 12)
![[ >3 ] cc would decay.” Boultons Epitome of Boyle $ works, vol. 2. pag. 246. From thefe experi¬ ments it may be obferved, that this liquid phof- phorus could not be made to emit light, with¬ out a communication with the air, not even by the utmoft agitation ; though when it had a free communication with the air, a fmall agitation greatly increafed the quantity and ftrength of the light; that, whenever the air was admitted to join it, a violent inteftine motion came on, by which motion or attrition, light was not only produced, but alfo a great deal of the liquid was carried off by it; which rhight be perceived ei¬ ther by the fight, or fmell. And when the vial had been long without a cork, by which means it was filled to the utmoft with air, the light would continue a confiderable time after the vial was ftopped. We likewife find, that, after the vial has been ftopped fome time, and the liquor has acfted upon the air as much as it poflibly can, there is not only a lefs quantity of grofs air than there was when the vial was firft ftopped, but that there is the fame vacuum as is made by the air pump; for as foon as ever it is unftopped, the air prefleth in with violence, the fluid above the phofphorus (within the vial) being of a more fubtle nature than the air without. This](https://iiif.wellcomecollection.org/image/b30375186_0012.jp2/full/800%2C/0/default.jpg)
