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