. Practical physics. overtones. In the cornet (Fig. 372) and in most forms of horns, valvesa, h, c, worked by the fingers, vary the length of thepipe, and hence such instruments can produce asmany series of fundamentals and overtones as thereare possible tube lengths. In the trombone thevariation of pitch isaccomplished by blow-ing overtones and by changing the length of the tube by a sliding U-shaped portion 418. The phonograph. In the original form of the phonograph the sound waves, collected by the cone, are carried to a thin metallic disk C (Fig. 373), exactly like a telephone diaphragm, w
. Practical physics. overtones. In the cornet (Fig. 372) and in most forms of horns, valvesa, h, c, worked by the fingers, vary the length of thepipe, and hence such instruments can produce asmany series of fundamentals and overtones as thereare possible tube lengths. In the trombone thevariation of pitch isaccomplished by blow-ing overtones and by changing the length of the tube by a sliding U-shaped portion 418. The phonograph. In the original form of the phonograph the sound waves, collected by the cone, are carried to a thin metallic disk C (Fig. 373), exactly like a telephone diaphragm, which takes up very nearly the vibration form of the wave which strikes it. This vibration form is 2^Pinianently impressed on the wax-coated cylinder ]\I by means of a stylus D which is attached to the back of the disk. When the stylus is run a second time over the groove which it first made in the wax, it receives again and imparts to the disk the vibration form which first fell ujjou it. This is the principle of the. Tig. 374. Mechanism for form-ing gramophone records VegefxAle- TissueDiaphragin
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
