Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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<
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>Along the ſide of this Tube was paſt
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ed a ſtraight narrow piece of Parchment,
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divided into twenty ſix equal parts, mark
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ed with black Lines and Figures, that by
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them might be meaſur'd both the inclu
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ded Air and its dilatation. </
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<
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>Afterwards
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we fill'd the Tube with Water almoſt to
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the top, and ſtopping the open end with
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a Finger, and inverting the Tube, the
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Air was permitted to aſcend to the above
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mention'd Glaſs bubble. </
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<
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>And by rea
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ſon this aſcent was very ſlow, it gave us
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the opportunity to mark how much more
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or leſs then one of the twenty ſix diviſi
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ons this Air took up. </
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<
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>By this means, af
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ter a tryal or two, we were inabled to con
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vey to the top of the Glaſs a bubble of
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Air equal enough, as to ſight, to one
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of thoſe Diviſions: Then the open end
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of the Tube being put into a ſmall Viol,
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whoſe bottom was cover'd with Water
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about half an Inch high; we included
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both Glaſſes into a ſmall and ſlender Re
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ceiver, and cauſed the Pump to be ſet a
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work. </
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<
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>The event was, That at the firſt
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exſuction of the Air there appear'd not
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any expanſion of the bubble, comparable
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to what appear'd at the ſecond, and that
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upon a very few exſuctions the bubble </
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