Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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the heat or cold that affected the ambient
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Air. </
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>But that which I was chiefly careful
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to obſerve, was this, That oftentimes the
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Quick-ſilver did riſe and fall in the Tube,
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and that very notably, without conforming
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it ſelf to what is uſual in Weather-glaſſes,
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whoſe Air is at the top, nay quite contrary
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thereunto: for ſometimes I obſerv'd it in
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very cold weather (ſuch as this Winter has
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already afforded us good ſtore of) to fall
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down much lower then at other times,
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when by reaſon of the abſence of both
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Froſt, Snow, and ſharp Winds, the Air was
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comparatively much warmer. </
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>And I fur
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ther obſerv'd, That ſometimes the Quick
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ſilver would for ſome days together reſt
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almoſt at the ſame height; and at other
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times again it would in the compaſs of the
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ſame day conſiderably vary its altitude,
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though there appear'd no change either in
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the Air abroad, or in the temper of the Air
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within the Room (wherein was conſtantly
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kept a good Fire) nor in any thing elſe, to
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which either I, or ſome eminently Learned
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Men whom I then acquainted with the
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Experiment, could reaſonably impute
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ſuch a change: Eſpecially conſidering that
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the ſpace wherein the Mercury wandred up
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and down, within about five Weeks, a
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mounted to full two Inches, of which we </
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