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air conduction curve amount of sound audible audiometer bels bone conduction curve bone conduction receiver carbon ampliﬁer carbon hearing aids carbon particles cell components conduction loss conductive deaf connected continuous frequency current variations cycles per second decibels deﬁcient hearing deﬁnite device diaphragm dry battery efﬁciency electrical current electrical energy electrical hearing aid electrical resistance ﬁrst ﬂow frequency characteristic frequency range greater hard of hearing hearing impairment hearing loss hearing trumpet horn impairment inﬂuence input instru instrument intensity loudness scale mastoid bone maximum power output ment obtained octave otologists pitch principles quencies range of frequencies relative reproduce requirements satisfactory hearing sound intensity sound output sound power output sound waves speaking tube speech sounds striking the transmitter sufﬁcient tion tone trigger tube hearing aid tuning fork type of hearing usually vacuum tube ampliﬁer vacuum tube hearing variations of air vibrations per second volts volume control wet battery wire