« AnteriorContinuar »
bottom: you shall hear the sound of the tongs every part of the air, not the whole in the whole knapped in the vessel of silver much more re- air, unless where the opening or passage is ex sounding than in the wooden one. Whereas, if ceedingly strait. For if one stand in any place the two vessels were empty, and you knapped utterly closed, so as the sound may not penetrato the tongs at the same distance, there should be at all, and that in any part soever of a sphere of little difference, or none. Whence it appears, sound, and there be a small opening made, the first, that where is no air that can be elided, but articulate voice shall enter through that opening, only water, sound is given; next, that the sound and in fine through as many openings as you given by the percussion communicates better shall choose to make through the whole round of with the vessel through water than through air. the sphere of sound : so as it is manifest that that The mouth being close shut, there is made a whole articulation of sound is conveyed entire in murmur (such as dumb persons use to make) by these minutest parts of the air, not less than if the throat; if the nostrils likewise be fast closed, the air were at large on every side. no murmur can be made. Whence it appears, It is, however, to be observed whether sounds that that sound by the throat is not effected unless proceeding from the greater pulsations of the air through the opening which lies between the (such as are made by the discharge of ordnance) throat and the nostrils.
become not more exile when they enter by those
small apertures; for it may be that the subtilties Of the Carriage of Sounds, and their Direction or of sound shall enter unconfused, but the whole
Spreading; and of the Area which Sound fills, crash, or roar, not so well. together and severally.
The rays of visible bodies do not strike the All sound is diffused in a sphere from the place sense, unless they be conveyed through the meof the percussion, and fills the whole area of this dium in straight lines, and the interposition of sphere to a certain limit, upwards, downwards, any opaque, in a right line, intercepts the sight, sideways, and every way.
although every thing else be on all sides wholly Throughout this orb the sound is loudest close open. But sound, if there be a dilatation or pasto the stroke; thence, in the proportion of the sage, whether by arching over, or by inverted distance, it grows more faint, until it vanishes. arching downwards, or laterally, or even by windThe limits of this sphere are extended some little ing, perishes not, but arrives. Nevertheless, I by reason of the quickness of hearing; yet is judge that sound is more strongly carried in there something uttermost, whither, to the most straight lines, betwixt the pulsations and the ear, delicate sense, sound reaches not.
and that by its archings and windings it is someThere is something, I think, in the direction of what broken; as, if there be a wall betwixt the the first impulsion; for, if a man should stand in speaker and the hearer, I think that the voice shall an open pulpit in the fields, and shout, the voice, not be so well heard as if the wall were away. I judge, should be further heard forwards from the I judge, too, that if the speaker or the hearer be speaker than behind. So, if ordnance, or a placed at a little distance from the wall, the voice harquebuss be discharged, I judge that the sound shall be better heard than nigh unto the wall, beshall be further heard before the ordnance or har-cause the arching so much the less departs from quebuss than behind it.
a right line. But this also would be further in Whether there be any thing in the ascension quired. of sound upwards, or in the descension of sound If the ear be laid to the one end of any tube or downwards, which may further sound, or make long hollow trunk, and a voice speak softly at the it cease nearer, doth not appear. The sound is other opening of the tube, such a voice shall be indeed well heard, if one speak from a high win- heard, which, being as softly spoken in the air at dow or turret, by those who stand upon the large, should not arrive, nor be heard. Whence ground; and, contrariwise, being uttered by those it is clear, that that confining of the air helps to that stand upon the ground from the window or the conveying of the voice, without confusion. turret, but by whether more easily, or further off, It is also a common opinion, that, other things let better inquiry be made.
being equal, the voice is better heard within doors Pulpits are used for speaking in assemblies, than abroad; but whether the voice be better and generals did usually speak standing upon heard when the ear is out of doors, and the voice mounds of sods; yet is it is no wise hence con- within the house; or contrariwise, when the voice firmed that sound easilier descends than it rises, is out of doors, and the ear within the house, may since the cause hereof may be the liberty of the be further inquired ; albeit herein also the opinion air in the higher place, not thronged or hindered, is received, that what is abroad is better heard as below amongst the crowd, but not the readier within doors, than what is within, abroad. motion downwards. Therefore, let not the con- It is common to hearing and sight, and, indeed, templation stay in this instance, but let a trial be in a certain measure, to the other senses, that the made where other things are equal.
attention of the perceiving mind, and express dj The power of the sound is received whole in rection to perceiving, help somewhat to perceiv
ing, as when one looks steadfastly, or (as they of the Variety of the Bodies which yield Sound; say) pricks his ears.
and the Instruments; and of the Species of Sounds are not carried so far, articulate and Sounds which occur. distinct, as their species, and a confused coil of them; for the hum of voices can be heard where The kinds of sounds appear to receive such a the articulate words themselves are not heard ; division: loud, soft, sharp or treble, base; musiand a confused tinkling of music, when the har- cal, unmusical; interior or whispering, exterior mony itself or tune is not heard.
or sounding; simple, compounded, original, reSound is preserved, at the best, in a hollow flected; so as they are divisions six. trunk. Therefore let there be taken a hollow The stronger the first pulsation shall be, and trunk of a good length, and let it be put out from the dilatation the more free, and without let, the the window of a lower chamber; let one speak greater is the sound given : the weaker the perby thrusting of his head out of the window, at cussion, and more disturbed the dilatation, the less. one end of the trunk, as softly as ever he may: Treble sounds are carried as far, and perchance let another lay his ear to the other end of the farther than base. Let this be better inquired. trunk, standing below upon the ground: let this Accordingly as the concave of a bell shall be be done in like wise reversely, by speaking from greater, it giveth a baser sound; the less, the below, and laying to of the ear above, and from more treble. this trial let a judgment be made, whether the The bigger a string, the baser sound it shall voice ascend or descend more easily, or even yield ; the less, the more treble. alike. They deliver for certain, that there be A string, the more tightly strained, the more some places and buildings so vaulted, that if one treble sound shall it yield; the looser, the baser : stand in a certain part of the chamber, and speak, so as a little bigger string more tightly strained, he can be better heard at some distance than near. and a less more slackly, shall give the same note.
All harmony appeareth to sound somewhat In trumpets, in like wise, in flutes, horns, and fuller and deeper at a little remoteness from the recorders, pipes, also in the mouth of a man place of the sound than near; so as something whistling, the more narrow and straight they should seem to happen to hearing about sound, are, they give the more treble sound; the wider, like as happeneth to sight about visible species, or more open, the baser. that some removal from the organ of the sense In flutes, the air, issuing by a hole nearer the furthereth the perception of the sense. But in breath, yields a more treble sound; by one more that opinion may be twofold error. First, because distant, a baser: so a little bigger flute by the in the act of sight there be, perhaps, beams re- nearer hole, and a smaller by the more removed, quired from the object to the pupil, which there may give the same note. cannot be where the object toucheth the pupil, In some stringed instruments (as in the viol, which between the hearing and the sound is not citterns, and the like) men have found a skill for required. But much rather, because to seeing is the straining of the strings, beyond the first light needed. But an object touching the pupil straining, so as compressing them with the finintercepts the light; whereas nothing of this kind gers lower down or higher up, they strain them befalls to hearing. And, in the second place, be to the alteration of the note. cause to sight there needeth not always a medium; If a drinking-cup of glass or silver be taken and forasmuch as, in the removing of cataracts of the fillipped, if the water stand higher in the cup, and eyes, the little silver needle wherewith the cata- the cup be fuller, it will give a more treble sound ; racts are removed, even when it moveth upon the if lower, and the cup be more empty, a baser. pupil within the coat of the eye, is excellently In a hollow pipe, such as they use for shoot
ing of birds, if one whistle with the mouth, In objects of sight, if the eye be placed in the setting the mouth to one end of the tube, the dark, and the object in the light, it shall do well; sound is dulled, truly, to the bystander; but if but if the object be placed in the dark, and the the ear be laid to the other end, it gives a most eye in the light, you shall not see. So, if a thin sharp sound, so as it shall hardly be borne. veil or net-work be cast over the eyes, the object Let there be a trial made with a trunk, in the is well seen; if upon the object, it confounds part where the ear is laid, narrow, in the part sight. And albeit, that perhaps neither of these where the mouth is set, wider, and conversely; agreeth to sound and hearing, yet may they ad- whether the sound be rendered more treble or vertise us that trials be made, whether the ear baser, after the manner of mirrors, which contract set against the hollow trunk, if the sound be or enlarge the objects of sight. made at a distance in the air at large, or conversely, the sound be produced at the hollow of the Multiplication, Majoration, Diminution, trunk, the ear being placed at a distance in the
and Fraction of Sound. air at large, favour more the perception of the It would be seen in what, how, way, manner,
sound can be artificialiy magnified and multiplied.
Mirrors do effect both in sight. Now, the sud
of the Repercussion of Sounds and Echo. den reflection of sound seems to turn to augmentation; for if the voice and echo be yielded
The repercussion of sounds (which we call together, need is that the sound be not distin- echo) can be taken for an argument that sound
is not a local motion of the air; for if it were, the guished, but magnified. Therefore, sounds upon rivers are greater, the water resounding and repercussion should be made in manner conforma
ble to the original, as happens in all corporeal blending itself with the original sound.
I have also noted that when a round-house is repercussions. But in sound, wherein such an made in water-conduits, then a long vault, and exact generation is required, as in the voice, then a greater chamber, (such as is to be seen in
which hath so many organs, and in musical inthe fields by Charing Cross near London,) if you which yield the repercussed sound have nothing
struments, which be curiously framed, the things cry at the window or slit of the round-house, and one stand by the window of the greater chamber, such, but are merely rude, having almost nothing a far more fearful roaring is heard than by one
save this, that sound passes not through them. standing where the cry is made. I bethink me that in the play of puppets, the
Of the Consents and Dissents of Audibles and speaking is such as it is heard distinctly, but far Visibles, and of other so called Spiritual Speciss. sharper and more exile than in the air at large; as happens in mirrors that render letters far smaller
They agree in these : than they are in the ordinary medium: so as
Both are diffused in a spherical compass or orb, sound appears plainly possible by art to be both and fill the whole area of that sphere, and are amplified and rendered more exile.
carried to very distant spaces, and wax faint by Children hold the horn of a bent bow betwixt degrees, according to the distance of the object, their teeth, and with an arrow strike the string, then vanish. Both carry their figurations and whence is produced a more resounding sound, and differences into minute portions of their orb, ena far greater boom, than if the bow were not held tire and unconfused, so as they are perceived in the teeth ; which they ascribe to the consent through small crannies no otherwise than in an which the bones of the teeth have with the bone open place. of hearing; since, conversely also, by a certain Both are of exceedingly sudden and swift harsh sound in the hearing, the teeth too be set generation and dilatation, and conversely they are on edge.
extinguished, and perish suddenly and quickly. In like manner, let a lance touch the wood of Both take and convey minute and exquisite the belly of an harp, especially of the hole in it differences, as of colours, figures, motions, disat the hollow end, and be held with the teeth at tances, in visibles; of articulate voices, of musical the other end, and the harp struck; the sound is tones, and of their swift changes and trepidation, made greater by taking hold with the teeth, that in audibles. is to say, to him that so taketh hold.
Both, in their virtue and force, appear neither It is most assured (however unnoted) that the to emit any corporeal substance into their meforce, which after the first percussion carries on diums or their orb, nor even to give forth or proballs, or arrows, or darts, and the like, is situated voke a local perceptible motion in their mediums, in the minute parts of the body discharged, and but to convey certain spiritual species, of which not in the air continually carrying it, like a boat the nature and manner is unknown. in the water. This being premised, it may be Both appear to be not generative of any other considered whether sound might not be lessened virtue or quality besides their proper virtue, and so in ordnance or a harquebuss, without much far to work, being else barren. weakening of the percussion, in this manner. Both in their
if corpoLet there be a harquebuss made with a barrel of really, to work three things. The first, that the a pretty strength, so as it break not easily; in stronger object drowns and confounds the weaker; the barrel let there be four or five holes made, not as the light of the sun, the light of a candle, the like chinks, but round, about the middle of the report of ordnance, the voice. The second, that barrel. The percussion hath already gotten its the more excellent object destroys the weaker force, excepting so far as by reason of the length sense; as the light of the sun, the eye, a violent of the barrel it may be increased ; but the percus- sound close at the ear, the hearing. The third, thai sion of the air at the mouth of the harquebuss, both are repercussed, as in mirrors and the echo. which generates the sound, will be much at- Neither doth the object of the one confound or tenuated by the emission of sound through those hinder the object of the other; as light or colour, holes in the middle of the barrel, before that the sound, or contrariwise. air enclosed arrive at the mouth of the harque- Both affect the sense in animals, and that by buss. Therefore it is probable that the sound and objects in greater or less degrees grateful or boom shall by many parts be diminished. odious: but they affect also after their own man
ner inanimates proportionate, and having (as cured of cataracts of the eyes, when the little silseemeth) a conformity with the organs of the ver needle moved over the very pupil of his eye, senses; as colours, a mirror, that is crystalline and did touch it, he, without any medium, (that like the eye; sounds, the places of reverberation, silver needle being far narrower than the pupil which seem, likewise, to resemble the bone and itself of the eye,) saw perfectly the needle. The cavern of the ear.
second, that the cave of the ear is distinctly interBoth work diversely, accordingly as they have posed before the organ of hearing, so as, being their mediums well or ill disposed.
without, the sound is altogether unable to touch To both the medium the most conducible and the bone and membrane of hearing. propitious is the air. In both the stretching of The species of sight are more swiftly conveyed the sense, and, as it were, its erection to perceiv- than sounds, as appeareth in the flash and report ing, availeth somewhat in more nice objects. of guns; also in lightning and thunder, where
the thunder is heard after a while. They differ in these :
I conceive also that the species of sound do 'The species of visibles appear to be as if emis- hang longer in the air than visibles. For, although sions of beams from the visible body, almost like neither do these perish on the instant, as we see odours. But the species of audibles appear more in a ring spinning, and lute-strings fillipped, and to partake of a local motion, like the percussions in twilight and the like; yet I deem that sounds, which are made in the air: that whereas bodies for that they are carried by the wind, stay for the most part work in two manners, by com- longer. munication of their nature, or by an impression or The beams of light being gathered, induce heat signature of their motion, that disľusion in visibles also, which is an action diverse from the visible appeareth more to partake of the former manner; quality. In like manner, if it be true that shouts in audibles, of the latter.
have cast down birds flying over, that is also an The dilatation of sounds appears to be more evi- action exceedingly diverse from the audible dently carried by the air than of visibles. For I quality. judge that a vehement wind shall not so much There seemeth not in visibles to be found an hinder any visible afar off, as a sound; I under- object as odious, and noisome to the sense, as in stand the wind blowing contrary.
audibles; but they affect it more evenly; for It is a notable difference, whence also many things foul to sight rather offend by moving of the less differences flow, that visibles (original light fancy concerning foul things than of themselves; excepted) are not carried but by right lines, but in audibles the grating of a saw that is sharpwhilst sounds are carried by arcuate lines. ened, and other like sounds, cause a horror; and
Hence it happens, that visibles confound not a discordant note in music is straightways reone another, that are represented together : sounds fused and loathed. contrarily. Hence it happens, that the solidity It is not assured, that there is refraction in of the substance seems not greatly to hinder sight, sounds, as in beams. But, doubtless, sounds do provided only the positions of the parts of the rebound: but that is to be ascribed to reflection. body be after a simple order and with straight For, I do not think, if sounds pass through passages, as in glass, water, crystal, diamond; diverse mediums, as air, cloth, wood, that there but a little silk or linen cloth breaks the sight, be one place of the sound, where it is carried, anthough they be bodies very thin and porous; but other where it is heard, which is the property of cloths of this kind little or nothing hinder hearing, refraction; but refraction seems to depend upon which those solids do exceedingly. Hence it action, in right lines, which pertains not to sound. happens, that unto the reverberation of visibles a But contraction of sound, and its dilatation, acsmall mirror suffices, or like transpicuous body, cording to the disposition of the medium, happens, let it be only placed in a right line, where the undoubtedly, as in the speaking of puppets, and visibles pass; but unto making of the reverbera- under water: the sound is contracted within that tion of echo, it needeth also to confine the sound cell, which abroad is dispersed ; as by mirrors from the side, because it is carried to all sides. visibles are dilated and contracted. The visible object is further carried, in proportion, A tremulous medium (as smoke in visibles) than sound.
makes the visible objects also to tremble; but in Visibles, too nearly approached to the eye, are sounds nothing such is yet found, unless, pernot so well seen as at some little distance, so as the chance, the rise and fall by winds. For the beams may meet in a more acute angle; but in trembling in the nightingale-pipe is trembling of hearing, the nearer the better. But herein there the percussion, not of the medium. may be twofold error. The rst, because to see- Going from great light into the or out of ing there is required light; but if the object be the dark into the light, the sight is some little brought very near to the eye, this is shut out. confused; but whether the like be after very loud For I have heard of one trustworthy, which was / noises, or a great silence, would be inquired.
Of the Quickness of the Generation and Extinction is, at King's College, in Cambridge, a certain of Sound, and the time in which they are effected. wooden building, in which there hang bells, and
that when the bells ring, it is shaken. But All sound is exceeding quickly generated, and whatsoever that hidden motion be, which is quickly perishes. But the swiftness of its mo- sound, it appears that neither is it engendered tion and of its differences, appears a thing not so without perceptible motion in the first pulsation, wonderful. For the motion of the fingers upon a and that again by the perceptible motion of the lute, or of the breath in the pipe or flute, are found air it is carried or hindered. to be exceedingly swift: and the tongue itself A word quietly uttered, which at a distance (no very exquisite organ) goes through as many perhaps of thirty feet can be heard, will yet hardly motions as letters; but that sounds should not stir the flame of a candle, that is held within a only be so speedily generated but that they should foot of the mouth ; whilst blowing a little strongly also, by their momentary force and impression, as with the mouth, shall make the flame to waver, it were, suddenly fill so great space, is matter at a much greater distance. worthy of the highest admiration. For instance, The sound of bells, and the like, comes louder, a man in the middle of a field, speaking aloud, is and goes off more dully, as the wind blows toheard for a quarter of a mile, in a round, and that wards the ear, or against the sound. The same in articulate words, and these hanging in every happens in a shout, which being uttered against little portion of the air, and all in a space of time the wind, is not heard so far. far less, perhaps, than a minute.
It is delivered, that through vast shouts of To inquire of the space of time in which sound numbers applauding and cries of rejoicing, the air is conveyed. It can be found thus. Let a man has been so broken or rarefied, that birds flying stand in a steeple by night; let another stand in over have fallen down. There runs an opinion the field, a mile off, perhaps, or as far as the bell that the noise of many bells ringing in populous can be heard, and let him have ready a torch cities is good against thunder and pestilence. lighted, but
vered. Then let him in the steeple Some places and buildings are certainly reported strike the bell: then let the other, who stands in to be so vaulted, that if one speak in them, and the plain, as soon as he hears it, lift the torch: in (as the report hath it) against the wall, in one this way, by the space of time between the strik-part of the building, his words shall be better ing of the bell and the seeing of the torch, shall heard at some distance from the voice than close he that stands in the steeple discover the time of at hand. the motion of the sound.
I have observed, sitting in a coach with one In guns, the flame is seen sooner than the re- side of the boot down, and the other up, that a port is heard, although the flame follow the dis- beggar crying on the closed side of the coach hath charging of the ball; so as the flash issues later, seemed to cry on the open side; so as the voice but sooner strikes the sense. Whence it is rightly was plainly repercussed, and went round, or at gathered, that the beams visible are more speedily the least, whilst it sounded on all sides, it seemed diffused, and arrive, than the species or impres- to be heard on that side, on which it did best reach sions of sound.
If a candle be held to the wind-hole of a drum, Of the Affinity, or Non-affinity, which Sound and the drum be beat, the flame is shaken and hath with the Molion, local and perceptible, of the extinguished. The same happens in winding of a Air in which it is carried.
hunter's horn, if the candle be brought near the Sound doth not appear manifestly and actually mouth of the horn, &c. to shake and trouble the air, as doth wind; but Even the exquisite differences which sound the motions of sound appear to be effected by takes, and carries them with it, show that these spiritual species; for thus we must speak, until delicate affections are not continued local motions. something more assured shall be found.
For seals, in a matter fitly prepared, make exquiSo as I conceive that a very loud sound of one site impressions; so as in the generation of sound shouting, at a little distance from the very motion this same, perhaps, might happen. But the dilaof the breath, shall scarcely stir any trembling tation and continuance sort not, especially in aspen leaf, or straw, or flame.
liquids: but those exquisite differences we underBut in greater pulsations there is found a very stand of articulate voices and musical tones. bodily and actual motion of the air; but whether But of this matter altogether (videlicet, what that proceed from the motion itself which gene- relation and correspondency sound has to the rates sound, or from a collateral cause, or some local motion of the air) let inquiry be more diliconcomitants, appeareth not. Thunder-claps gently made; not by the way, whether? (which sometimes make glass windows to tremble, and sort of question in matters of this kind has ruined even walls: I think, also, that ordnance let off, all,) but by the way, how far? and that not by or explosions of mines, do the same.
arguments discursive, but by opposite experiments And I remember, if I mistake not, that there and crucial instances.