Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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ſel. </
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<
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>Whereas when the Flame went out
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upon the exſuction of the Air one time
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(when the Flame retir'd very leaſurely
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to the top) we perceived it not to be fol
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low'd by any ſmoke at all. </
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<
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>And at an
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other time the upper part of the Week
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remaining kindled after the extinction
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of the Flame, the ſlender ſteam of Fumes
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that did ariſe aſcended but a very little
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way, and then after ſome uncertain mo
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tions this and that way, did, for the moſt
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part, ſoon fall downwards. </
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>Being deſirous alſo to try whether
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there would be any difference as well in
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our Receiver as there is wont to be elſe
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where betwixt Candles made of Wax and
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thoſe made of Tallow, as to their dura
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tion; we took ſlender Tapers of white
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Wax, (commonly called Virgins Wax)
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that being found to burn with much leſs
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ſmoke then common yellow Wax: Six
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of theſe of like bigneſs, and each of them
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of about the thickneſs of a Swans Quill,
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we preſſ'd together into one Candle: And
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having lighted all the Weeks, we let in
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the above-mention'd Wax into the Re
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ceiver, and made what haſte we could to
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cloſe it up with Cement. </
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<
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>But though in
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the mean while we left open the Valve </
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