6733Century II.
but runneth in ſilence, if it be of any depth;
but the very Stream upon Shal-
lows, or Gravel, or Pebble, will be heard. And Waters, when they beat up-
on the Shore, or are ſtraitned, (as in the falls of Bridges) or are daſhed againſt
themſelves by Winds, give a roaring noiſe. Any peece of Timber, or hard
Body, being thruſt for wards by another Body continguous, without knock-
ing giveth no noiſe. And ſo Bodies in weighing, one upon another, though
the upper Body preſs the lower Body down, make no noiſe. So the motion
of the Minute parts of any ſolid Body, (which is the principal cauſe of violent
Motion, though unobſerved) paſſeth without ſound: For that ſound, that is
heard ſometimes, is produced onely by the breaking of the Air, and not by
the impulſion of the parts. So it is manifeſt, that where the anterior Body
giveth way as ſaſt as the poſterior cometh on, it maketh no noiſe, be the
motion never ſo great or ſwift.
lows, or Gravel, or Pebble, will be heard. And Waters, when they beat up-
on the Shore, or are ſtraitned, (as in the falls of Bridges) or are daſhed againſt
themſelves by Winds, give a roaring noiſe. Any peece of Timber, or hard
Body, being thruſt for wards by another Body continguous, without knock-
ing giveth no noiſe. And ſo Bodies in weighing, one upon another, though
the upper Body preſs the lower Body down, make no noiſe. So the motion
of the Minute parts of any ſolid Body, (which is the principal cauſe of violent
Motion, though unobſerved) paſſeth without ſound: For that ſound, that is
heard ſometimes, is produced onely by the breaking of the Air, and not by
the impulſion of the parts. So it is manifeſt, that where the anterior Body
giveth way as ſaſt as the poſterior cometh on, it maketh no noiſe, be the
motion never ſo great or ſwift.
Air open and at large, maketh no noiſe, except it be ſharply percuſſed;
11116. as in the ſound of a ſtring, where Air is purcuſſed by a hard and ſtiff Body, and
with a ſharp looſe: For it the ſtring be not ſtrained, it maketh no noiſe; but
where the Air is pent and ſtraitned, there breath or other blowing (which
carry but a gentle percuſſion) ſuffice to create ſound; as in Pipes and Wind
Inſtruments. But then you muſt note, that in Recorders which go with a
gentle breath, the Concave of the Pipe (were it not for the Fipple that ſtrait-
neth the Air much more then the ſimple Concave) would yield no ſound.
For, as for other Wind-Inſtruments, they require a forcible breath, as Trum-
pets, Cornets, Hunters, Horns, & c. Which appeareth by the blown Cheeks of
him that windeth them. Organs alſo are blown with a ſtrong wind by the
Bellows. And note again, that ſome kinde of Wind-Inſtruments are blown
at a ſmall hole in the ſide, which ſtraineth the breath at the firſt entrance;
the rather, in reſpect of their traverſe, and ſtop above the hole which per-
formeth the Fipples part; as it is ſeen in Flutes and Fifes, which will not give
ſound by a blaſt at the end, as Recorders do, & c. Likewiſe in all Whiſtling,
you contract the Mouth; and to make it more ſharp, Men ſometimes uſe their
finger.
11116. as in the ſound of a ſtring, where Air is purcuſſed by a hard and ſtiff Body, and
with a ſharp looſe: For it the ſtring be not ſtrained, it maketh no noiſe; but
where the Air is pent and ſtraitned, there breath or other blowing (which
carry but a gentle percuſſion) ſuffice to create ſound; as in Pipes and Wind
Inſtruments. But then you muſt note, that in Recorders which go with a
gentle breath, the Concave of the Pipe (were it not for the Fipple that ſtrait-
neth the Air much more then the ſimple Concave) would yield no ſound.
For, as for other Wind-Inſtruments, they require a forcible breath, as Trum-
pets, Cornets, Hunters, Horns, & c. Which appeareth by the blown Cheeks of
him that windeth them. Organs alſo are blown with a ſtrong wind by the
Bellows. And note again, that ſome kinde of Wind-Inſtruments are blown
at a ſmall hole in the ſide, which ſtraineth the breath at the firſt entrance;
the rather, in reſpect of their traverſe, and ſtop above the hole which per-
formeth the Fipples part; as it is ſeen in Flutes and Fifes, which will not give
ſound by a blaſt at the end, as Recorders do, & c. Likewiſe in all Whiſtling,
you contract the Mouth; and to make it more ſharp, Men ſometimes uſe their
finger.
But in open Air, if you throw a Stone or a Dart, they give no ſound:
22117. No more do Bullets, except they happen to be a little hollowed in the caſt-
ing; which hollowneſs penneth the Air: Nor yet Arrows, except they be
ruffled in their Feathers, which like wiſe penneth the Air. As for ſmall Whi
ſtles or Shepherds Oaten-Pipes, they give a ſound, becauſe of their extream
ſlenderneſs, whereby the Air is more pent than in a wider Pipe. Again, the
voices of Men and Living Creatures, paſs through the Throat, which pen.
neth the breath. As for the Jews-Harp, it is a ſharp percuſſion, and beſides hath
the vantage of penning the Air in the Mouth.
22117. No more do Bullets, except they happen to be a little hollowed in the caſt-
ing; which hollowneſs penneth the Air: Nor yet Arrows, except they be
ruffled in their Feathers, which like wiſe penneth the Air. As for ſmall Whi
ſtles or Shepherds Oaten-Pipes, they give a ſound, becauſe of their extream
ſlenderneſs, whereby the Air is more pent than in a wider Pipe. Again, the
voices of Men and Living Creatures, paſs through the Throat, which pen.
neth the breath. As for the Jews-Harp, it is a ſharp percuſſion, and beſides hath
the vantage of penning the Air in the Mouth.
Solid Bodies, if they be very ſoftly percuſſed, give no ſound;
as when a
33118. Man treadeth very ſoftly upon Boards. So Cheſts or Doors in fair weather,
when they open eaſily, give no ſound. And Cart-wheels ſqueek not when
they are liquored.
33118. Man treadeth very ſoftly upon Boards. So Cheſts or Doors in fair weather,
when they open eaſily, give no ſound. And Cart-wheels ſqueek not when
they are liquored.
The Flame of Tapers or Candles, though it be a ſwift motion and breaketh
44119. the Air, yet paſſeth without ſound. Air in Ovens, though (no doubt) it doth
(as it were) boil, and dilate it ſelf, and is repercuſſed, yet it is without noiſe.
44119. the Air, yet paſſeth without ſound. Air in Ovens, though (no doubt) it doth
(as it were) boil, and dilate it ſelf, and is repercuſſed, yet it is without noiſe.
Flame percuſſed by Air, giveth a noiſe;
As in blowing of the Fire by Bel-
lows, greater than if the Bellows ſhould blow upon the Air it ſelf. And ſo
likewiſe Flame percuſſing the Air ſtrongly (as when Flame ſuddenly taketh
and openeth) giveth a noiſe: So great Flames, whiles the one impelleth the
other, give a bellowing ſouud.
lows, greater than if the Bellows ſhould blow upon the Air it ſelf. And ſo
likewiſe Flame percuſſing the Air ſtrongly (as when Flame ſuddenly taketh
and openeth) giveth a noiſe: So great Flames, whiles the one impelleth the
other, give a bellowing ſouud.