Of the Velocity of Air passing into an Exhausted receiver by Denis Papin

View transcription
                                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

Denis Papin
Open IIIF manifest
(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



Please login to comment