Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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of it: Then the Receiver muſt be taken
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off from the Pump, that the upper Ori
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fice of the Cylinder remaining open, the
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Air may freely ſucceed the Sucker, and
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therefore readily yield to its motion
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downward. </
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<
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>This done, there muſt be
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faſten'd to one of the Iron Teeth of the
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Sucker, ſuch a weight as may juſt ſuffice
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to draw it to the bottom of the Cylinder.
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>And having thus examin'd what weight is
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neceſſary to draw down the Sucker, when
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the Atmoſphere makes no other then the
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ordinary reſiſtance of the Air againſt its
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deſcent; the Sucker muſt be again forc'd
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to the top of the Cylinder, whoſe upper
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Orifice muſt now be exactly cloſed; and
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then (the firſt weight remaining) we eaſi
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ly may, by hanging a Scale to the above
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mention'd Iron (that makes part of the
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Sucker) caſt in known weights ſo long,
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till in ſpight of the reluctancy of the At
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moſphere the Sucker be drawn down. </
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>For
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to theſe weights in the Scale, that of the
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Scale it ſelf being added, the ſum will give
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us the weight of a Column of Air, equal
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in Diameter to the Sucker, or to the ca
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vity of the Cylinder; and in length to
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the heighth of the Atmoſphere. </
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Experi
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ment
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33.</
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<
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>According to this method we did, ſince </
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