. Practical physics. Tig. 374. Mechanism for form-ing gramophone records VegefxAle- TissueDiaphragin. The diamond point Fig. 375. The Edison diamond reproducer 356 PROPERTIES OF MUSICAL SOUNDS dictaphone and the ediphone, used to replace stenogi-aphers in businessoffices. The typist writes the letter by listening to the reproductionof the dictation. In the most familiar of the modern forms of the phonograph (graiuo-phone, etc.) the needle point D, instead of digging a groove in wax,vibrates back and forth (see Fig. 374) over a greased zinc disk. Thiswavy trace in the disk is etched out with ch
. Practical physics. Tig. 374. Mechanism for form-ing gramophone records VegefxAle- TissueDiaphragin. The diamond point Fig. 375. The Edison diamond reproducer 356 PROPERTIES OF MUSICAL SOUNDS dictaphone and the ediphone, used to replace stenogi-aphers in businessoffices. The typist writes the letter by listening to the reproductionof the dictation. In the most familiar of the modern forms of the phonograph (graiuo-phone, etc.) the needle point D, instead of digging a groove in wax,vibrates back and forth (see Fig. 374) over a greased zinc disk. Thiswavy trace in the disk is etched out with chromic acid. Then a coppermold is made by the electrotyping process, and as many as a thousandfacsimiles of the original wavy line are impressed on hard-rubber disksby heat and jaressure. When the needle is again run over the disk, itfollows along the wavy groove and transmits to the diaphragm C vibra-tions exactly like those which originally fell upon it. Spoken wordsand vocal and orchestral music are reproduced in pitch, loudness, andquality with wonderful exactness. This instrument is one of th
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
