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. </s>
              <s>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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                <emph type="italics"/>
              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. </s>
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              <s>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. </s>
              <s>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-</s>
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