. Bell telephone magazine . gs would thus bestimulated. There is little doubt that many of these early aids weredistinctly helpful to those afflicted with hearing , the amount of sound amplification which could besecured, within practicable limitations of size and weight, bymechanical means remained a serious limitation to a successfulsolution by this method. As telephone apparatus became more efficient in convertingsound energy into electrical energy and back again into soundenergy, more and more of those with impaired hearing foundthat they could often carry on telephone co
. Bell telephone magazine . gs would thus bestimulated. There is little doubt that many of these early aids weredistinctly helpful to those afflicted with hearing , the amount of sound amplification which could besecured, within practicable limitations of size and weight, bymechanical means remained a serious limitation to a successfulsolution by this method. As telephone apparatus became more efficient in convertingsound energy into electrical energy and back again into soundenergy, more and more of those with impaired hearing foundthat they could often carry on telephone conversations moreeasily than they could talk with others face-to-face. Thisnaturally suggested the idea of a portable telephone system as a hearing aid. It was not until about 1900, however, thatan easily portable acousto-electrical system, consisting of atransmitter, receiver and a small dry-cell battery, was madeavailable. 106 Fig. 1. Nox-AMPLipiER TypeOF AuDiPHONE, ShowingAir-conduction Receiver,Plug, Microphone, andCords. Fig. 2. Audiphone Ar-rangement WITH LeatherCarrying Case Having Com-partments FOR Microphone,Amplifier, Battery, andCords. The Lorgnette Han-dle, Bone-conduction Re-ceiver, and Air-conductionReceiver Are Also Shown ,jh»ft^f Fig. 4. The 6A Audi-ometer, WITH AccessoryEquipment. A: 126AAudiometer Index : 12SA Audiometer In-dex Ring. C;100A Audi-ometer Masking Attach-ment. D: Signal : Power Plug. F: 705AReceiver. G: 14A HeadBand. H: 700A Receiver
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
