1their way upwards. This, I ſay, is of
no great importance to our preſent Diſ
courſe, ſince either way the Terreſtrial
Steam may here and there conſiderably
alter the gravity or preſſure of the At
moſphere.
no great importance to our preſent Diſ
courſe, ſince either way the Terreſtrial
Steam may here and there conſiderably
alter the gravity or preſſure of the At
moſphere.
Your Lordſhip may alſo be pleaſed to
remember, That by our ſeventeenth Ex
periment it appear'd that as when the Air
in the Receiver was expanded more then
ordinarily, the Quick-ſilver in the Tube
did proportionably ſubſide; ſo when the
Air in the ſame Receiver was a little more
then ordinarily compreſſ'd, it did impell
up the Quick-ſilver in the Tube above
the wonted height of betwixt ſix and ſe
ven and twenty digits.
remember, That by our ſeventeenth Ex
periment it appear'd that as when the Air
in the Receiver was expanded more then
ordinarily, the Quick-ſilver in the Tube
did proportionably ſubſide; ſo when the
Air in the ſame Receiver was a little more
then ordinarily compreſſ'd, it did impell
up the Quick-ſilver in the Tube above
the wonted height of betwixt ſix and ſe
ven and twenty digits.
And if to theſe things we annex, that
for ought we can finde by tryals purpoſe
ly made, the degree of rarity or denſity
of the Air, ſhut up into our Receiver, does
not ſenſibly alter its temperature as to
cold or heat. It will not, I hope, appear
abſurd to conceive, That ſince the Air,
included in the Tube, could but very faint
ly hinder the aſcent of the Quick-ſilver,
or preſs it downwards, ſince too that inclu
ded Air could ſcarce immediately receive
any ſenſible alteration, ſave either by heat
for ought we can finde by tryals purpoſe
ly made, the degree of rarity or denſity
of the Air, ſhut up into our Receiver, does
not ſenſibly alter its temperature as to
cold or heat. It will not, I hope, appear
abſurd to conceive, That ſince the Air,
included in the Tube, could but very faint
ly hinder the aſcent of the Quick-ſilver,
or preſs it downwards, ſince too that inclu
ded Air could ſcarce immediately receive
any ſenſible alteration, ſave either by heat
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