8551Century III.
Light is in an inſtant.
This may be tried in far greater diſtances, allowing
greater Lights and Sounds.
greater Lights and Sounds.
It is generally known and obſerved, that Light and the object of Sight,
11210. move ſwifter than Sound; for we ſee the flaſh of a piece is feen ſooner,
than the noiſe is heard. And in hewing Wood, if one ſome diſtance off, he
ſhall ſee the Arm lifted up for a ſecond ſtroke, before he hear the noiſe of the
firſt; and the greater the diſtance, the greater is the prevention: As we ſee in
Thunder, which is far off, where the Lightning precedeth the crack a good ſpace.
11210. move ſwifter than Sound; for we ſee the flaſh of a piece is feen ſooner,
than the noiſe is heard. And in hewing Wood, if one ſome diſtance off, he
ſhall ſee the Arm lifted up for a ſecond ſtroke, before he hear the noiſe of the
firſt; and the greater the diſtance, the greater is the prevention: As we ſee in
Thunder, which is far off, where the Lightning precedeth the crack a good ſpace.
Colours, when they repreſent themſelves to the Eye, fade not nor melt
22211. not by degrees, but appear ſtill in the ſame ſtrength; but Sounds melt, and
vaniſh, by little and little. The cauſe is, for that Colours participate nothing
with the motion of the Air, but Sounds do. And it is a plain argument that
Sound participateth of ſome Local Motion of the Air, (as a cauſe Sine quâ
non) in that it periſheth ſo ſuddenly: For in every Section, or Impulſion of
the Air, the Air doth ſuddenly reſtore and reunite it ſelf, which the Water
alſo doth, but nothing ſo ſwiftly.
22211. not by degrees, but appear ſtill in the ſame ſtrength; but Sounds melt, and
vaniſh, by little and little. The cauſe is, for that Colours participate nothing
with the motion of the Air, but Sounds do. And it is a plain argument that
Sound participateth of ſome Local Motion of the Air, (as a cauſe Sine quâ
non) in that it periſheth ſo ſuddenly: For in every Section, or Impulſion of
the Air, the Air doth ſuddenly reſtore and reunite it ſelf, which the Water
alſo doth, but nothing ſo ſwiftly.
IN the Tryals of the Paſſage, or not Paſſage of Sounds, you muſt take heed
33Experiments
in Conſotr,
touching the
Paſſage and
Interceptions
of Sounds. you miſtake not the paſſing by the ſides of a Body, for the paſſing thorow
a Body; and therefore you muſt make the Intercepting Body very cloſe;
for Sound will paſs thorow a ſmall chinck.
33Experiments
in Conſotr,
touching the
Paſſage and
Interceptions
of Sounds. you miſtake not the paſſing by the ſides of a Body, for the paſſing thorow
a Body; and therefore you muſt make the Intercepting Body very cloſe;
for Sound will paſs thorow a ſmall chinck.
Where Sound paſſeth thorow a hard, or cloſe Body (as thorow Water,
44212. thorow a Wall, thorow Metal, as in Hawks Bells ſtopped, & c.) the hard
or cloſe Body, muſt be but thin and ſmall; for elſe it deadeth and extinguiſh-
eth the Sound utterly. And therefore, in the Experiment of Speaking in
Air under Water, the voice muſt not be very deep within the Water, for then
the Sound pierceth not. So if you ſpeak on the further ſide of a cloſe Wall,
if the Wall be very thick, you ſhall not be heard; and if there were an Hogs-
head empty, where of the ſides were ſome two foot thick, and the Bung-
hole ſtopped. I conceive, the reſounding ſound by the Communication of
the outward Air with the Air within, would be little or none, but onely you
ſhall hear the noiſe of the outward knock, asif the Veſſel were full.
44212. thorow a Wall, thorow Metal, as in Hawks Bells ſtopped, & c.) the hard
or cloſe Body, muſt be but thin and ſmall; for elſe it deadeth and extinguiſh-
eth the Sound utterly. And therefore, in the Experiment of Speaking in
Air under Water, the voice muſt not be very deep within the Water, for then
the Sound pierceth not. So if you ſpeak on the further ſide of a cloſe Wall,
if the Wall be very thick, you ſhall not be heard; and if there were an Hogs-
head empty, where of the ſides were ſome two foot thick, and the Bung-
hole ſtopped. I conceive, the reſounding ſound by the Communication of
the outward Air with the Air within, would be little or none, but onely you
ſhall hear the noiſe of the outward knock, asif the Veſſel were full.
It is certain, that in the paſſage of Sounds thorow hard Bodies, the Spirit
55213. or Pneumatical part of the hard Body it ſelf doth co-operate; but much
better, when the ſides of that hard Body are ſtruck, than when the percuſſi-
on is onely within, withouttouch of the ſides. Take therefore a Hawks-Bell,
the holes ſtopped up, and hang it by a thred within a Bottle-Glaſs, and ſtop
the Mouth of the Glaſs very cloſe with Wax, and then ſhake the Glaſs, and ſee
whether the Bell give any ſound at all, or how weak? But note, that you muſt
inſtead of Thred take a Wire, or elſe let the Glais have a great Belly, leſt
when you ſhake the Bell, it daſh upon the ſides of the Glaſs.
55213. or Pneumatical part of the hard Body it ſelf doth co-operate; but much
better, when the ſides of that hard Body are ſtruck, than when the percuſſi-
on is onely within, withouttouch of the ſides. Take therefore a Hawks-Bell,
the holes ſtopped up, and hang it by a thred within a Bottle-Glaſs, and ſtop
the Mouth of the Glaſs very cloſe with Wax, and then ſhake the Glaſs, and ſee
whether the Bell give any ſound at all, or how weak? But note, that you muſt
inſtead of Thred take a Wire, or elſe let the Glais have a great Belly, leſt
when you ſhake the Bell, it daſh upon the ſides of the Glaſs.
It is plain that a very long and down right arch for the Sound to paſs,
66214. will extinguiſh the Sound quite, ſo that that Sound, which would be heard
over a Wall, will not be heard over a Church; nor that Sound, which will
be heard, if you ſtand ſome diſtance from the Wall, will be heard if you
ſtand cloſe under the Wall.
66214. will extinguiſh the Sound quite, ſo that that Sound, which would be heard
over a Wall, will not be heard over a Church; nor that Sound, which will
be heard, if you ſtand ſome diſtance from the Wall, will be heard if you
ſtand cloſe under the Wall.
So tand Foraminous Bodies in the firſt creation of the Sound, will dead
77215. it; for the ſtriking againſt Cloth or Fur, will make little ſound, as hath been
ſaid: But in the paſſage of the ſound, they will admit it better than harder
Bodies, as we ſee, that Curtains and Hangings will not ſtay the ſound much,
but Glaſs windows, if they be very cloſe, will check a ſound more, than the
like thickneſs of Cloth. We ſee alſo in the rumbling of the Belly, how
caſily the Sound paſſeth thorow the Guts and Skin.
77215. it; for the ſtriking againſt Cloth or Fur, will make little ſound, as hath been
ſaid: But in the paſſage of the ſound, they will admit it better than harder
Bodies, as we ſee, that Curtains and Hangings will not ſtay the ſound much,
but Glaſs windows, if they be very cloſe, will check a ſound more, than the
like thickneſs of Cloth. We ſee alſo in the rumbling of the Belly, how
caſily the Sound paſſeth thorow the Guts and Skin.
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