EXPERIMENT II. Concerning the Force requisite to draw down the Sucker: The Opinion of a Modern Naturalist examin'd.
* 1.1THough the Sucker may be easily drawn down, by the help of the Manubrium▪ yet without that it will require a Force capable
The works of the Honourable Robert Boyle, Esq., epitomiz'd by Richard Boulton ... ; illustrated with copper plates.
About this Item
- Title
- The works of the Honourable Robert Boyle, Esq., epitomiz'd by Richard Boulton ... ; illustrated with copper plates.
- Author
- Boyle, Robert, 1627-1691.
- Publication
- London :: Printed for J. Phillips ... and J. Taylor ...,
- 1699-1700.
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- Subject terms
- Physics -- Early works to 1800.
- Chemistry -- Early works to 1800.
- Medicine -- 15th-18th centuries.
- Link to this Item
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http://name.umdl.umich.edu/A28936.0001.001
- Cite this Item
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"The works of the Honourable Robert Boyle, Esq., epitomiz'd by Richard Boulton ... ; illustrated with copper plates." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A28936.0001.001. University of Michigan Library Digital Collections. Accessed June 15, 2024.
Pages
Page 316
of raising so much of the Atmosphere as presses upon it: The Reason of which is evident, from Mercury suspended in a Tube; for tho' the Weight of the Atmosphere is able to ballance and keep it up to twenty five Digits; yet if the suspended Mercury exceeds that height, it pre∣sently over-powers the Pressure of the incum∣bent Atmosphere, and subsides to its just height. And as from hence we may learn, why it is so difficult to draw down the Sucker; so it like∣wise teaches us, for what Reasons the Sucker, when so violently forced down, upon a Relaxa∣tion of that Force rises up again; for the Spring of the Air included being weak, it must conse∣quently be buoy'd up by the Pressure of the Ex∣ternal, till that which is contain'd in the Re∣ceiver be equally compress'd, so as to be able to resist the Pressure of the Atmosphere. There is one Thing more remarkable in this Experi∣ment, which is, that if the Valve be stopped close, when the Sucker is rais'd to the Top of the Cylinder, it finds an equal Resistance by the Pressure of the Atmosphere when first drawn, as when nearer the Bottom of the Cylinder; from whence we may gather, that what an Eminent Modern Naturalist delivers concerning the Rea∣son of the violent Ingress of exhausted Air, viz. That it is encreas'd by the Addition of that Force, which it receives from the Air sucked out, is a mi∣stake; for were it so, it would be more difficult to draw down the Sucker, when it is further from the Receiver, a greater quantity of Air being exhausted. But from what hath been premis'd in the first Experiment, it is evident, that the weaken'd Pressure of the Internal Air,
Page 217
is sufficient to account for the more violent In∣gress of the External.
Notes
-
* 1.1
What Weight is requisite to draw down the Sucker.