Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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by the Diggers, that even when the Sky
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ſeem'd clear, there would not ſeldom ſud
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denly ariſe, and ſometimes long continue,
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a certain Steam (which they uſually call a
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damp) ſo groſs and thick, that it would
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oftentimes put out their very Candles, if
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they did not ſeaſonably prevent it. </
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I think it will eaſily be granted, that the
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aſcenſion of ſuch Steams into this or that
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part of the Air, and their mixing with it,
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are very like to thicken it; as on the o
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ther ſide either heat or the ſudden conden
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ſation of the Air in another part of the At
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moſphere (to mention now no other cau
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ſes) are capable of rarifying it. </
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>Nor will it very much import the main
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ſcope of our Diſcourſe, whether it be
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ſuppoſ'd that the copious Steams the
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earth ſends into the air, thicken that part
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of the Atmoſphere that receives them,
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and make it more heavy: Or that ſome
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times the Fumes may aſcend with ſuch ce
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lerity, that though the Air be thicken'd
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yet they rather diminiſh then encreaſe its
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gravitation, in regard that the quickneſs
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of their aſcent, not onely keeps them
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from gravitating themſelves, but may
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hinder the preſſing downwards of many
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Aërial Corpuſcles that they meet with in </
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