Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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we muſt anſwer, That of thoſe which are
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eaſily intelligible without ocular demon
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ſtration, we can at preſent ſuggeſt upon
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our own tryals no better then theſe. </
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>Firſt,
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at the open end of the Tube the Glaſs
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muſt not onely be made as even at the ed
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ges as you can, but it is very conveni
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ent (eſpecially if the Tube be large) that
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the bottom be every way bent inwards,
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that ſo the Orifice, not much exceeding a
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quarter of an Inch in Diameter, may be
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the more eaſily and exactly ſtopp'd by the
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Experimenter's finger; between which
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and the Quick-ſilver, that there may be
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no Air intercepted (as very often it hap
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pens that there is) it is requiſite that the
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Tube be fill'd as full as poſſibly it can be,
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that the finger which is to ſtop it, preſſing
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upon the accumulated and protuberant
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Mercury, may rather throw down ſome,
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then not finde enough exactly to keep out
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the Air. </
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>It is alſo an uſeful and compen
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dious way not to fill the Tube at firſt
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quite ful of Mercury, but to leave near the
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top about a qnarter of an Inch empty; for
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if you then ſtop the open end with your
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finger, and invert the Tube that quarter
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of an Inch of Air will aſcend in a great
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bubble to the top, and in its paſſage thi-</
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