Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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Air; you hold a Coal or Brand in that
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ſtream of Vapors that iſſues out of the
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narrow mouth of it, you will finde this
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vapid or rorid Air, (if I may ſo call it)
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to blow the Fire very ſtrongly and with a
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roaring noiſe. </
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>And that it be not ſaid
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that 'tis by the external Air which the a
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queous ſteams drive before them, and
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not by the Steams themſelves, that the
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Blaſt is made and the Flame excited; it
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has been obſerv'd, that by approaching
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the Coal or Brand almoſt to the mouth
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of the
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Æolipile,
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the winde appear'd more
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vehement then if the Body to be kindled
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were held ſome Inches off. </
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>But in regard the elaſtical power of the
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Stream, iſſuing out of an
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Æolipile,
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ſeems
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manifeſtly due to the heat that expands
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and agitates the aqueous Particles where
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of that Stream conſiſts, and that ſuch
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rapid winds ſeem to be but water ſcatter'd
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into little parts and ſet a moving; ſince
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we finde, that holding a Knife, or any
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ſolid, ſmooth and cloſe Body againſt the
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ſtream that iſſues out of the Æolipile, the
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vapors condenſing upon it, will preſently
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cover it with water: It will be very per
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tinent to ſubjoyn a notable Experiment
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that I remember I have met with in the </
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