1ſubject to looſe of it's ſnbſtance in the
cooling, for (as we have elſewhere noted
on another occaſion) Copper heated red
hot is wont in the cooling to throw off
little thin ſcales in ſuch plenty, that having
purpoſely watcht a Copper Æolipile du
ring its refrigeration, we have ſeen the
place round about it almoſt covered with
thoſe little ſcales it had every way ſcat
ter'd: which, however they amount not
to much, ought not to be over-looked,
when 'tis ſo light a body as Air, that is
to be weighed. We will not examine,
whether the Æolipile in cooling may not
receive ſome little increment of weight,
either from the vapid or ſaline Steames
that wander up and downe in the Air: But
we will rather mention, that (for the grea
ter exactneſſe) we imployed to weigh our
Æolipile, both when fill'd onely with Air
and when repleniſht with Water, a paire
of ſcales that would turne (as they ſpeak)
with the fourth part of a grain.
cooling, for (as we have elſewhere noted
on another occaſion) Copper heated red
hot is wont in the cooling to throw off
little thin ſcales in ſuch plenty, that having
purpoſely watcht a Copper Æolipile du
ring its refrigeration, we have ſeen the
place round about it almoſt covered with
thoſe little ſcales it had every way ſcat
ter'd: which, however they amount not
to much, ought not to be over-looked,
when 'tis ſo light a body as Air, that is
to be weighed. We will not examine,
whether the Æolipile in cooling may not
receive ſome little increment of weight,
either from the vapid or ſaline Steames
that wander up and downe in the Air: But
we will rather mention, that (for the grea
ter exactneſſe) we imployed to weigh our
Æolipile, both when fill'd onely with Air
and when repleniſht with Water, a paire
of ſcales that would turne (as they ſpeak)
with the fourth part of a grain.
As to the proportion of weight be
twixt Air and Water, ſome learned men
have attempted it by wayes ſo unaccurate
that they ſeeme to have much miſtaken
it. For (not to mention the improbable
accounts of Kepler and others.) The lear-
twixt Air and Water, ſome learned men
have attempted it by wayes ſo unaccurate
that they ſeeme to have much miſtaken
it. For (not to mention the improbable
accounts of Kepler and others.) The lear-