1it ſelfe when repleniſhed with Air, full
eleven graines. That is, the Air contain
able within the cavity of the Æolipile a
mounted to eleven graines and ſomewhat
more; I ſay ſomewhat more, becauſe of
the particles of the Air, that were not
driven by the fire out of the Æolipile.
And by the way (if there be no miſtake
in the obſervations of the diligent Mer
ſennus) it may ſeeme ſtrange that it ſhould
ſo much differ from 2. or 3. of ours; in
none of which we could rarifie the Air in
our Æolipile (though made red hot almoſt
all over, and ſo immediately plung'd into
cold water) to halfe that degree which he
mentions, namely to 70. times it's natu
rall extent, unleſſe it were that the Æo
lipile he imploy'd was able to ſuſtaine
a more vehement heat then ours (which
yet we kept in ſo great an one, that once
the ſoder melting, it fell aſunder into the
two Hemiſpheres it conſiſts of.)
eleven graines. That is, the Air contain
able within the cavity of the Æolipile a
mounted to eleven graines and ſomewhat
more; I ſay ſomewhat more, becauſe of
the particles of the Air, that were not
driven by the fire out of the Æolipile.
And by the way (if there be no miſtake
in the obſervations of the diligent Mer
ſennus) it may ſeeme ſtrange that it ſhould
ſo much differ from 2. or 3. of ours; in
none of which we could rarifie the Air in
our Æolipile (though made red hot almoſt
all over, and ſo immediately plung'd into
cold water) to halfe that degree which he
mentions, namely to 70. times it's natu
rall extent, unleſſe it were that the Æo
lipile he imploy'd was able to ſuſtaine
a more vehement heat then ours (which
yet we kept in ſo great an one, that once
the ſoder melting, it fell aſunder into the
two Hemiſpheres it conſiſts of.)
The fore-mentioned way of weighing
the Air by the help of an Æolipile, ſeems
ſomewhat more exact then that which
Merſennus uſed, In that in ours the Æoli
pile was not weighed, till it was cold;
whereas in his, being weighed red hot, it
the Air by the help of an Æolipile, ſeems
ſomewhat more exact then that which
Merſennus uſed, In that in ours the Æoli
pile was not weighed, till it was cold;
whereas in his, being weighed red hot, it