Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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              and twenty ounces and an halfe, and as
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              much Air as was requiſite to fill it weigh­
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              ing eleven graines, the proportion in gra­
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              vity of Air to Water of the ſame bulk
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              will be as one to 938. And though we
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              could not fill the Æ
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              olipile
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              with water, ſo
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              exactly as we would, yet in regard we
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              could not either as perfectly as we would,
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              drive the Air out of it by heat; we think
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              the proportion may well enough hold:
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              but thoſe that are delighted with round
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              numbers (as the phraſe is) will not be
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              much miſtaken if they reckon water to be
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              neere a thouſand times heavier than Air.
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              </s>
              <s>And (for further proof that we have made
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              the proportion betwixt theſe two bodies
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              rather greater then leſſer then indeed it is;
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              and alſo to confirme our former obſerva­
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              tion of the weight of the Air) we will adde,
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              That, having another time put ſome Wa­
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              ter into the Æ
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              olipile
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              before we ſet it on
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              the fire, that the copious vapours of the
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              rarefied liquor might the better drive out
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              the Air, we found, upon try all carefully
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              made, that when the Æ
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              olipile
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              was refrige­
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              rated, and the included vapours were by
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              the cold turned againe into water (which
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              could not have happen'd to the Air, that
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              the preceeding Steams expell'd) the Air, </s>
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