Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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upper part of the Tube, that having after
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wards let in the external Air, the Water
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was not thereby impell'd to the top of the
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Tube (three Foot in length) within a lit
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tle more then half an Inch. </
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<
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>And whe
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ther or no it were Air that poſſeſſ'd that
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ſpace at the top of the Tube which was
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not fill'd with Water, we took this courſe
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to examine. </
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<
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>We drew the ſecond time
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the Air out of the Receiver, and found,
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that by reaſon of the body that poſſeſſ'd
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the top of the Tube, we were able not
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onely to make the Water in the Tube fall
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to a level with the ſurface of the Water
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in the Veſſel: But alſo (by plying the
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Pump a little longer) a great way beneath
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it: which ſince it could not well be aſcrib'd
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to the bare ſubſiding of the Water by rea
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ſon of its own weight, argued that the Wa
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ter was depreſſ'd by the Air: which was
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confirm'd by the Figure of the ſurface of
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the Water in the Tube, which was much
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more concave then that of Water in
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Tubes of that bigneſs uſes to be. </
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<
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>And
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this further tryal (to adde that upon
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the by) we made at the ſame time, That
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when the Water in the Pipe was drawn
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down almoſt as low as the Water without
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it, we obſerv'd, that (though we deſiſted </
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