Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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when it was let in, increaſ'd the weight of
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the
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Æolipile
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as much as before, namely,
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Eleven Grains; though there were alrea
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dy in it twelve Drachmes and a half, be
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ſides a couple of Grains of Water, which
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remain'd of that we had formerly put in
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to it to drive out the Air. </
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Merſennus
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indeed tells us, that by his
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account Air is in weight to Water, as 1 to
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1356. And adds, that we may, without
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any danger, believe that the gravity of
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Water to that of Air of a like bulk, is
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not leſs then of 1300 to 1. And conſe
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quently, that the quantity of Air to a
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quantity of Water equiponderant there
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to, is as 1300 to 1. But why we ſhould
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relinquiſh our own carefully repeated try
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als, I ſee not. </
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>Yet I am unwilling to re
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ject thoſe of ſo accurate and uſeful a Wri
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ter: And therefore ſhall propoſe a way
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of reconciling our differing Obſervations,
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by preſenting, that the diſcrepance be
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tween them may probably ariſe from the
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differing conſiſtence of the Air at
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London
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and at
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Paris:
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For our Air being more cold
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and moiſt, then that which Your Lord
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ſhip now breaths, may be ſuppoſ'd alſo
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to be a fourth or fifth part more heavy. </
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leave it to be conſider'd, whether it be of </
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