Show the curiosities cupl josities of pf sound everything heard can be placed on its proper musical note some interesting experiments which will WW determine this truth in very high or mountainous region sounds become diminished in loudness ao that a conversation cannot le car ned ried on in an ordinary ton toot e of voice in mines or in a diving bell tell the reverse of this is the case speech becomes so startling that it must be carried on in whispers to be at all endurable to the ear sounds of all kinds become must cal cat it if the vibrations of air are uniform and rapid enough says the baltimore american it Is said that the puffs of an engine would make a tremendous organ peal of music it if they could be made to attain the rapidity of 50 or 60 a second everything in nature has its key note as it were and attuned to one particular musical sound this fact can be very easily verified in everyday life stand near an open piano and speak in an ordinary tone while speaking you will suddenly hear a string within rever reverberate to your voice the tick of a watch the sound of every human voice the bark of a dog the mew of a cat eat the noise of a wagon the roll of thunder the fall of rain the running of water in fact everything about us can easily be placed by an attentive ear on its proper musical note one of 0 the sounds of the scale this Is a most interesting experiment and easily veri verl fled by any one inclined to skeptic cism it is said that the ear can distin golsh eleven octaves of sound but as a rule those made by quick short vibrations brat ions are more easily conveyed for instance the whirr of a locust makes more distinct impression than the sigh ing of the wind through the trees A whirlwind in its approach Is noiseless it is only when it strikes some ob stacle that the volume of sound be comes terrific to us then we receive the secondary shorter waves from the destruction of this obstacle tyndall says all friction is rhythmic flames are notoriously sensitive to sound they will bend and flicker and even respond with a leap of quivering light to a high shrill sand this Is another interesting experiment it if we use a glass tube with a small jet of gas by lowering or raising it to tain points we can cause it to shriek out shrilly or to answer ly to its own keynote when sung or spoken by the voice philadelphia ledger |