Materiarum Quarundam Gravitates Specificae, Diversis Temporibus ad Varios Scopos Exploratae a D. G. Fahrenheit, R. S. S.

tery of the Dog was but a small matter bigger than the Crural Arteries of the former Dog. This shews, that the Styptick Quality of these Tinctures is very inconsiderable; and that Helvetius's Tincture is rather better than Dr. Eaton's, if there is any Difference at all; though that, I believe, was owing to the Brandy, for my Brandy was stronger than Dr. Eaton's. I enquired for the Dog the next Morning, and found him alive and well, only hanging his Head on one Side, which proceeded from the Muscles being cut through. VI. Materiarum quarundam gravitates Specificae, diversis temporibus ad varios scopos exploratæ a D. G. Fahrenheit, R. S. S. | Material | Specific Gravity | |---------------------------|------------------| | Aurum | 19081 | | Mercurius | 13575* | | Plumbum | 11350 | | Argentum | 10481 | | Cuprum Sueicum | 8834 | | Idem Japonense | 8799 | | Ferrum | 7817 | | Stannum provinciæ Indiæ Orientalis vulgo dictæ Malacca | 7364 | | Stannum Anglicanum | 7313 | | Marcasita alba | 9850 | | Regulus Antimonii | 6622 | | Aurichalcum | 8412 | | Crystallus de rupe | 2669 | | Pyrites homogeneus | 2584 | Cinis clavellatus sordibus, faleq; neutro quodam (quod fere semper magis vel minus in cinere illo reperiatur) depurgatus — — — — 3112 Sal illud neutrum — — — — 2642 Sal maritimum — — — — 2125 Nitrum — — — — 2150 Alumen — — — — 1738 Saccharum albissimum — — — — 1606½ Oleum Vitrioli — — — — 1877½* Lixivium cineris clavellati fale quantum fieri potuit imprægnatum — — — — 1563 * Idem alio tempore præparatum — — — — 1571½* Aqua fortis melioris notæ — — — — 1409 * Spiritus nitri — — — — 1293½* Aqua pluviatilis — — — — 1000 * Oleum Rararum — — — — 913 Alcohol vini — — — — 826 Idem magis dephlegmatum. — — — — 825 Experimenta variis sunt facta modis. Corpora enim fixa, ut vulgo fieri solet, prius bilancis accuratoris ope in aere & deinde in aqua pluviatili sunt ponderata. Salium pondus, prius in aere, & tunc in liquore idoneo quodam est exploratum, & deinde calculo ad gravitatem aquæ comparatum. Liquorum gravitates, interdum Aræometro quodam singulari (cujus descriptio nem alio tempore dabo) aliquando autem vasibus hic delineatis sunt indagatæ. Globus Globus Vitreus concavus A (Fig. 1.) ad Lampadis flammam satis magnus conficitur, duobus tubulis vitreis sibi oppositis B & B præditus. Tubulorum extremitates sunt apertæ, attenuatae, & aliquantisper incurvatæ, ne liquor effluere possit. Globulus præterea in inferiori loco aliquantulum est applanatus, ut eo commodius bilanci imponi possit. Icones instrumentorum qua inservierunt ad facienda experimenta de gravitate specificâ liquorum. Ampulla A (Fig. 2.) e tenuissimo vitro ad lampadis flammam paratur, collo satis largo prædita, cujus apertura operculo B, intus concavo tam accurate, quam fieri potest, clauditur. Ope hujus ampullæ, etiam salium gravitates specificæ explorari possunt, & quidem hoc modo. Ampulla prius liquore quodam idoneo (in quo nempe sal, cujus gravitas exploranda est; non solvitur) impletur, & postquam liquoris innotuit pondus, liquor effunditur, atque vas probe exsiccatur. Hoc facto, sale fere totum vas impletur, & salis pondus inquiritur; hoc noto, interstitia salis liquore replentur, ponderisq; incrementum a liquore addito quæritur. Si hocce incrementum ponderis a pondere toto liquoris subtrahitur, residuum exprimet gravitatem liquoris a sale deturbati. Sal neutrum cineris clavellati in spiritu nitri nullam facit ebullitionem. Mercurium in spiritu nitri solutum albo colore præcipitat. Carbonibus superimpositum; crepitu in minores partes disrumpitur & dispersitur. Nitrum in tigillo supra ignem fuit liquefactum, ut eo modo ab omni humiditate depurgaretur, spatiaque nonnulla aëre alias plena nitro ipso replerentur. Gravitates liquorum, quæ asterisco notatae sunt, ad gradum quadragesimum octavum meorum thermometrorum calculo fuit revocatæ, & nonnullorum jam in* experimentis de gradu ebullitionis liquorum quorundam facta est mentio. Modus simplicissimus ad investigandam gravitatis differentiam, quæ a diverso temperamento fluidorum originem suam trahit, est, ut prius liquore minus calido (cujus tamen gradus ope Thermometri notus esse debet) vas aliquod repleatur, & ponderetur, deinde illud vas iterum calidiori liquore impleatur, & ut prius ponderetur. Si in hoc secundo experimento gradus caloris iterum est notatus, habebitur differentia gravitatis liquoris, a calore inter hos gradus effecta, quæ deinde ope calculi facile unicuique gradui attribui potest. * Phil. Trans. No. 381. Experimenta in aere sunt facta: addenda ergo erit unicuiq; numero gravitas aeris, ut habeatur materia- rum gravitas in vacuo. Est autem aeris gravitas spe- cifica ad illam aquae, fere ut 1 ad 1000, utpote Philosof- phiæ naturalis cultoribus abunde patet. VII. Some Considerations about the Cause of the uni- versal Deluge, laid before the Royal Society, on the 12th of December 1694. By Dr. Ed- mond Halley, R. S. S. The Account we have of the universal Deluge is no where so express as in the Holy Scriptures; and the exact Circumstances as to point of Time, do shew that some Records had been kept thereof more particularly than is wont in those things derived from remote Tradition, wherein the Historical Minu- tiae are lost by length of Time. But the same seem much too imperfect to be the Result of a full Reveala- tion from the Author of this dreadful Execution up- on Mankind, who would have spoke more amply as to the Manner thereof, had He thought fit to lay open the Secrets of Nature to the succeeding Race of Men; and I doubt not but to all that consider the 7th Chap- ter of Genesis impartially, it will pass for the Remains of a much fuller Account of the Flood left by the Pa- triarchs to their Posterity, and derived from the Re- velation of Noah and his Sons. It must be granted, that there are some Difficulties as to the Construction of the Ark, the Reception and Agreement of the Animals among themselves, and Preservation of it in so immense and boundless an Ocean, during that Wind which