_ For if the Ball be placed under a
part of the Bladder which is upon one side of the middle of its pressure,
and you press strongly against the Bladder, you shall find the Ball moved
from the middle towards the sides.
Having therefore shewn the reason of the motion of any float towards the
sides, the reason of the incursion of any two floating bodies will easily
appear: For the rising of the water against the sides of either of them, is
an Argument sufficient, to shew the pressure of the Air to be there less,
then it is further from it, where it is not so much elevated; and therefore
the reason of the motion of the other toward it, will be the same as
towards the side of the Glass, only here from the same reason, they are
mutually moved toward each other, whereas the side of the Glass in the
former remains fixt. If also you gently fill the Jar so full with water,
that the water is _protuberant_ above the sides, the same piece of Cork
that before did hasten towards the sides, does now fly from it as fast
towards the middle of the Superficies; the reason of which will be found no
other then this, that the pressure of the Air is stronger against the sides
of the Superficies G and H, then against the middle I; for since, as I
shewed before, the Principle of congruity would make the terminating
Surface Spherical, and that the flatting of the Surface in the middle is
from the abatement of the waters pressure outwards, by the contrary
indeavour of its gravity; it follows that the pressure in the middle must
be less then on the sides; and therefore the consecution will be the same
as in the former.
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