
that drove the bullet: I did therefore take notice that in this occasion the Air bear’s a pressure much about the same as that of water when it’s spring is 32 foot high: now such water would spout out with a sufficient velocity to ascend 32 foot perpendicular: and therefore, according to the rules and observations of <u>Galileus <\u> Mr Halley etc, such water hath the velocity of 44 foot in a second. It remains therefore but to know the proportion of the gravity of <s>the <\s> Air to that of water: and we have found it to be always not the same: because the heigth, the heat, and the moisture of the Atmosphaere are variable: nevertheless we may say in general that the reason between the specifick gravitys of Water and Air is much about 840. [text?] taking then their square root’s, as I have say’d above, which root’s are 29. and 1. we may conclude that the velocity of Air must exceed that of water by 29 times: and so multiplying 44 velocity of water by 29 we <s>will <\s> shall find that the Velocity of Air driven by the whole pressure of the Atmosphaere is about 1364 foot in a second.
Please login to transcribe
Manuscript details
- Author
- Denis Papin
- Reference
- CLP/18i/35
- Series
- Cl.P
- Date
- 1686
- IIIF
-
(What's this?)This is a link to the IIIF web URL for this item. You can drag and drop the IIIF image link into other compatible viewers
Cite as
Of the Velocity of Air passing into an Exhausted receiver by Denis Papin, 1686. From The Royal Society, CLP/18i/35
Comments