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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>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, </
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