Scientific amusements . cisely as the vibrationsact from without through the auricle. We need hardlyadd that if the ear be injured the Audiphone will be ofno use. A writer says: From personal observation withthe Audiphone it appears to convey, the sonorous vibrationsto the ear through the teeth, just as a long wooden rodheld in the teeth will convey the vibrations of the sounding-board of a piano, though the piano is in another room THE AUDIPHONE. 179 and out of hearing by the ear. In using the Audiphoneduring conversation there is no movement or vibration feltby the teeth ; in Hstening to a p
Scientific amusements . cisely as the vibrationsact from without through the auricle. We need hardlyadd that if the ear be injured the Audiphone will be ofno use. A writer says: From personal observation withthe Audiphone it appears to convey, the sonorous vibrationsto the ear through the teeth, just as a long wooden rodheld in the teeth will convey the vibrations of the sounding-board of a piano, though the piano is in another room THE AUDIPHONE. 179 and out of hearing by the ear. In using the Audiphoneduring conversation there is no movement or vibration feltby the teeth ; in Hstening to a piano there is a very faintsensation as if the Audiphone vibrated slightly, while withthe handle of the Audiphone resting on the sounding-boardof the piano the vibrations are so violent as to be painfulto the teeth. By closing the ears a person with even acutehearing can observe the admirable manner in which theinstrument conveys spoken words to the ear. The Audi-phone will prove to be of great value to deaf mutes, as it. The Telephone, enables them to hear their own voices, and thus to trainthem to express words, while, before, they could onlymake inarticulate sounds. We have a variation of this instrument which has beenintroduced employing a diaphragm held in a telephonemouthpiece, and free to vibrate under the influence ofsounds. This is connected by a string to a bit of woodthat may be held in the In use the hearer placesthe wood between his teeth, the string is drawn tight, andthe speaker speaks through the telephone mouthpiece, thevibrations of the diaphragm being then conveyed to theteeth through the stretched string. This apparatus works l8o SOUND, very successfully, and ladies use it, but it is not so con-venient for general use as the Audiphone. The Telephone is now in daily use in London, and isby no means strange to the majority of our countrymen,,still some description of it will probably be acceptable,and a glance at its history may prove interesting. In sp
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
