1For firſt we may know the capacity of the
Receiver wherein the Experiment is
made, ſince, by filling it with water, we
may eaſily compute how many Quarts, or
Meaſures of any other denomination, it
contains of Air; which Air, when ſhut
up in the Veſſel, may be ſuppoſ'd to have
a preſſure equal to that of the Atmo
ſphere; ſince it is able to keep the Quick
ſilver in the Tube from falling any lower
then it did in the free and open Air. Next
here is given us the capacity of the braſs
Cylinder empty'd by the drawing down
of the Sucker (its bore and height being
mention'd in the deſcription of our Pump)
whereby we may come to know how
much of the Air contain'd in the Recei
ver is drawn out at the firſt ſuck. And
we may alſo eaſily define, either in weight
or cubick meaſures the Cylinder of
Quick-ſilver that anſwers to the Cy
linder of Air lately mention'd (that
Mercuriall Cylinder being in our En
gine computable by deducting from
the entire altitude or that Cylinder of
Quick-ſilver, the altitude at which it reſts
upon the firſt exſuction.) But though, if
this Experiment were very watchfully
try'd in Veſſels of ſeveral ſizes, and the
Receiver wherein the Experiment is
made, ſince, by filling it with water, we
may eaſily compute how many Quarts, or
Meaſures of any other denomination, it
contains of Air; which Air, when ſhut
up in the Veſſel, may be ſuppoſ'd to have
a preſſure equal to that of the Atmo
ſphere; ſince it is able to keep the Quick
ſilver in the Tube from falling any lower
then it did in the free and open Air. Next
here is given us the capacity of the braſs
Cylinder empty'd by the drawing down
of the Sucker (its bore and height being
mention'd in the deſcription of our Pump)
whereby we may come to know how
much of the Air contain'd in the Recei
ver is drawn out at the firſt ſuck. And
we may alſo eaſily define, either in weight
or cubick meaſures the Cylinder of
Quick-ſilver that anſwers to the Cy
linder of Air lately mention'd (that
Mercuriall Cylinder being in our En
gine computable by deducting from
the entire altitude or that Cylinder of
Quick-ſilver, the altitude at which it reſts
upon the firſt exſuction.) But though, if
this Experiment were very watchfully
try'd in Veſſels of ſeveral ſizes, and the
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