Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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ſubject to looſe of it's ſnbſtance in the
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cooling, for (as we have elſewhere noted
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on another occaſion) Copper heated red
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hot is wont in the cooling to throw off
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little thin ſcales in ſuch plenty, that having
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purpoſely watcht a Copper
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Æolipile
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du
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ring its refrigeration, we have ſeen the
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place round about it almoſt covered with
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thoſe little ſcales it had every way ſcat
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ter'd: which, however they amount not
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to much, ought not to be over-looked,
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when 'tis ſo light a body as Air, that is
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to be weighed. </
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>We will not examine,
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whether the Æ
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olipile
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in cooling may not
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receive ſome little increment of weight,
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either from the vapid or ſaline Steames
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that wander up and downe in the Air: But
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we will rather mention, that (for the grea
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ter exactneſſe) we imployed to weigh our
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Æolipile,
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both when fill'd onely with Air
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and when repleniſht with Water, a paire
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of ſcales that would turne (as they ſpeak)
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with the fourth part of a grain. </
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>As to the proportion of weight be
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twixt Air and Water, ſome learned men
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have attempted it by wayes ſo unaccurate
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that they ſeeme to have much miſtaken
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it. </
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>For (not to mention the improbable
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accounts of
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Kepler
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and others.) The lear-</
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