1librium with two weights, whereof the
one was of Lead, the other of Cork. And
having evacuated the Receiver, we obſer
ved, that both upon the exſuction, and
after the return of the Air, the Cork did
manifeſtly preponderate, and much more
a while after the Air had been let in again,
then whilſt it was kept out. Wherefore,
in the room of the Cork, we ſubſtituted
a piece of Char-coal, as leſs likely to im
bibe any moiſture from the Air, but the
event proved much the ſame with that
newly related: So that this Experiment
ſeems more liable to Caſualties then any,
excepting one we have made in our En
gine. And as it is difficult to prevent
them, ſo it ſeems not very eaſie to diſ
cover the cauſes of them, whereof we
ſhall therefore at preſent forbear mention
ing our Conjectures.
one was of Lead, the other of Cork. And
having evacuated the Receiver, we obſer
ved, that both upon the exſuction, and
after the return of the Air, the Cork did
manifeſtly preponderate, and much more
a while after the Air had been let in again,
then whilſt it was kept out. Wherefore,
in the room of the Cork, we ſubſtituted
a piece of Char-coal, as leſs likely to im
bibe any moiſture from the Air, but the
event proved much the ſame with that
newly related: So that this Experiment
ſeems more liable to Caſualties then any,
excepting one we have made in our En
gine. And as it is difficult to prevent
them, ſo it ſeems not very eaſie to diſ
cover the cauſes of them, whereof we
ſhall therefore at preſent forbear mention
ing our Conjectures.
SOme Learned Mathematicians have of
late ingenioùſly endeavored to reduce
Filters to Siphons; but ſtill the true cauſe
of the aſcenſion of Water, and other Li
quors, both in Siphons and in Filtration,
needing (for ought we have yet found) a
clearer Diſcovery and Explication, we
late ingenioùſly endeavored to reduce
Filters to Siphons; but ſtill the true cauſe
of the aſcenſion of Water, and other Li
quors, both in Siphons and in Filtration,
needing (for ought we have yet found) a
clearer Diſcovery and Explication, we