1yond the poſſible Altitude of the Ramparts of water, it would dive
and ſink; but if whilſt it is going downwards, one ſhould make
certain Banks or Ramparts about it, that ſhould hinder the do fuſion
of the water upon the ſaid Plate, the which Banks ſhould riſe ſo
high, as that they might be able to contain as much water, as ſhould
weigh equally with the ſaid Plate, it would, without all Queſtion,
deſcend no lower, but would reſt, as being ſuſtained by vertue of
the Air contained within the aforeſaid Ramparts: and, in ſhort,
there would be a Veſſell by this means formed with the bottom of
Lead. But if the thinneſs of the Lead ſhall be ſuch, that a very
ſmall height of Rampart would ſuffice to contain ſo much Air, as might
keep it afloat, it ſhall alſo reſt without the Artificiall Banks or
parts, but yet not without the Air, becauſe the Air by it ſelf makes
Banks ſufficient for a ſmall height, to reſiſt the Superfuſion of the
water: ſo that that which in this caſe ſwimmes, is as it were a
Veſſell filled with Air, by vertue of which it continueth afloat.
and ſink; but if whilſt it is going downwards, one ſhould make
certain Banks or Ramparts about it, that ſhould hinder the do fuſion
of the water upon the ſaid Plate, the which Banks ſhould riſe ſo
high, as that they might be able to contain as much water, as ſhould
weigh equally with the ſaid Plate, it would, without all Queſtion,
deſcend no lower, but would reſt, as being ſuſtained by vertue of
the Air contained within the aforeſaid Ramparts: and, in ſhort,
there would be a Veſſell by this means formed with the bottom of
Lead. But if the thinneſs of the Lead ſhall be ſuch, that a very
ſmall height of Rampart would ſuffice to contain ſo much Air, as might
keep it afloat, it ſhall alſo reſt without the Artificiall Banks or
parts, but yet not without the Air, becauſe the Air by it ſelf makes
Banks ſufficient for a ſmall height, to reſiſt the Superfuſion of the
water: ſo that that which in this caſe ſwimmes, is as it were a
Veſſell filled with Air, by vertue of which it continueth afloat.
I will, in the laſt place, with an other Experimeut, attempt to
remove all difficulties, if ſo be there ſhould yet be any doubt leſt in
any one, touching the opperation of this ^{*}Continuity of the Air, with
remove all difficulties, if ſo be there ſhould yet be any doubt leſt in
any one, touching the opperation of this ^{*}Continuity of the Air, with
*Or rather
tiguity,
tiguity,
Whether Figure have any influence upon the encreaſe or
tion of the Reſiſtance in any Weight againſt its being raiſed in the
Air, and I ſuppoſe, that I am to maintain the Affirmative,
ing that a Maſs of Lead, reduced to the Figure of a Ball, ſhall be
raiſed with leſs force, then if the ſame had been made into a thinne
and broad Plate, becauſe that it in this ſpacious Figure, hath a great
quantity of Air to penetrate, and in that other, more compacted and
contracted very little: and to demonſtrate the truth of ſuch my
pinion, I will hang in a ſmall thred firſt the Ball or Bullet, and put
that into the water, tying the thred that upholds it to one end of
the Ballance that I hold in the Air, and to the other end I by degrees
adde ſo much Weight, till that at laſt it brings up the Ball of Lead
out of the water: to do which, ſuppoſe a Gravity of thirty Ounces
ſufficeth; I afcerwards reduce the ſaid Lead into a flat and thinne
Plate, the which I likewiſe put into the water, ſuſpended by three
threds, which hold it parallel to the Surface of the water, and
ting in the ſame manner, Weights to the other end, till ſuch time as
the Place comes to be raiſed and drawn out of the water: I finde
that thirty ſix ounces will not ſuffice to ſeperate it from the water,
and raiſe it thorow the Air: and arguing from this Experiment, I
firm, that I have fully demonſtrated the truth of my Propoſition.
He re my Oponents deſires me to look down, ſhewing me a thing
tion of the Reſiſtance in any Weight againſt its being raiſed in the
Air, and I ſuppoſe, that I am to maintain the Affirmative,
ing that a Maſs of Lead, reduced to the Figure of a Ball, ſhall be
raiſed with leſs force, then if the ſame had been made into a thinne
and broad Plate, becauſe that it in this ſpacious Figure, hath a great
quantity of Air to penetrate, and in that other, more compacted and
contracted very little: and to demonſtrate the truth of ſuch my
pinion, I will hang in a ſmall thred firſt the Ball or Bullet, and put
that into the water, tying the thred that upholds it to one end of
the Ballance that I hold in the Air, and to the other end I by degrees
adde ſo much Weight, till that at laſt it brings up the Ball of Lead
out of the water: to do which, ſuppoſe a Gravity of thirty Ounces
ſufficeth; I afcerwards reduce the ſaid Lead into a flat and thinne
Plate, the which I likewiſe put into the water, ſuſpended by three
threds, which hold it parallel to the Surface of the water, and
ting in the ſame manner, Weights to the other end, till ſuch time as
the Place comes to be raiſed and drawn out of the water: I finde
that thirty ſix ounces will not ſuffice to ſeperate it from the water,
and raiſe it thorow the Air: and arguing from this Experiment, I
firm, that I have fully demonſtrated the truth of my Propoſition.
He re my Oponents deſires me to look down, ſhewing me a thing