Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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and cloſ'd it ſpeedily as before; and then
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waiting till the Fire ſeem'd totally ex
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tinct without medling with the Pump, we
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found that from the time the Veſſel was
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cloſ'd till that no Fire at all could be per
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ceiv'd there had paſſed about four mi
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nutes: Whereby it ſeem'd to appear that
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the drawing away of the ambient Air
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made the Fire go out ſooner then other
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wiſe it would have done; though that part
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of the Air that we drew out left the more
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room for the ſtifling ſteams of the Coals
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to be received into. </
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>Laſtly, Having taken out the Wier
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and put other Coals into it, we did, in the
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ſame Room where the Engine ſtood, let it
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hang quietly by a ſtring in the open Air,
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to try how long the Fire would laſt with
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out agitation when no Air was kept from
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it. </
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>And we found that the Fire began to
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go out firſt at the top and out-ſides of the
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Coals; but inwards and near the bottom
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the Fire continu'd viſible for above half
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an hour, a great part of the Coals, eſpe
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cially thoſe next the bottom, being burnt
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to aſhes before the Fire went out. </
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>We cauſ'd likewiſe a piece of Iron to
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be forg'd, of the bigneſs of a middle ſiz'd
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Char-coal, and having made it red hot </
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