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

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                                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.
                            
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Manuscript details

Author
Denis Papin
Reference
CLP/18i/35
Series
Cl.P
Date
1686
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Of the Velocity of Air passing into an Exhausted receiver by Denis Papin, 1686. From The Royal Society, CLP/18i/35

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