1between the events may aſſure us that we
were not much miſtaken.
were not much miſtaken.
We took then a Glaſs Pipe, of the
form of an inverted Siphon, whoſe ſhape
is delineated in the ſixteenth Figure: And
pouring into it a quantity of Quick ſilver,
we held it ſo, that the ſuperficies of the
Liquor, both in the longer and ſhorter
leg, lay in a Horizontal Line, denoted in
the Scheme by the prick'd Line EF; then
pouring Water into the longer Leg of the
Siphon, till that was almoſt fill'd, we ob
ſerv'd the ſurface of the Quick-ſilver in
that leg to be, by the weight of the Wa
ter, depreſſ'd, as from E to B; and in
the ſhorter leg, to be as much impell'd
upward as from F to G: Whereupon ha
ving formerly ſtuck marks, as well at the
point B, as at the oppoſite point D, we
mealur d both the diſtance DC to have
the height of the Cylinder of Quick-ſil
ver, which was raiſ'd above the Point D
(level with the ſurface of the Quick-ſilver
in the other leg) by the weight of the Wa
ter, and the diſtance BA which gave us
the height of the Cylinder of Water. So
that the diſtance DC amounting to (2 12/54)
Inches, and the height of the Water a
mounting (30 45/50) Inches; and the whole
form of an inverted Siphon, whoſe ſhape
is delineated in the ſixteenth Figure: And
pouring into it a quantity of Quick ſilver,
we held it ſo, that the ſuperficies of the
Liquor, both in the longer and ſhorter
leg, lay in a Horizontal Line, denoted in
the Scheme by the prick'd Line EF; then
pouring Water into the longer Leg of the
Siphon, till that was almoſt fill'd, we ob
ſerv'd the ſurface of the Quick-ſilver in
that leg to be, by the weight of the Wa
ter, depreſſ'd, as from E to B; and in
the ſhorter leg, to be as much impell'd
upward as from F to G: Whereupon ha
ving formerly ſtuck marks, as well at the
point B, as at the oppoſite point D, we
mealur d both the diſtance DC to have
the height of the Cylinder of Quick-ſil
ver, which was raiſ'd above the Point D
(level with the ſurface of the Quick-ſilver
in the other leg) by the weight of the Wa
ter, and the diſtance BA which gave us
the height of the Cylinder of Water. So
that the diſtance DC amounting to (2 12/54)
Inches, and the height of the Water a
mounting (30 45/50) Inches; and the whole
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