A text-book of the diseases of the ear for students and practitioners . NTS TO AID THE HEARING 839 action of this instrument, which is free from secondary noises,should, according to Kugel, be very satisfactory. The so-called otophones have proved of little value. Theyconsist of two bent strips of spring metal, by the applicationof which on the mastoid process, the auricle is raised from theside of the head and directed towards the waves of sound whichstrike it from in front. The concave hearing-cups made of hardrubber are more efficacious, but are used only by women (Leiter,of Vienna). They a
A text-book of the diseases of the ear for students and practitioners . NTS TO AID THE HEARING 839 action of this instrument, which is free from secondary noises,should, according to Kugel, be very satisfactory. The so-called otophones have proved of little value. Theyconsist of two bent strips of spring metal, by the applicationof which on the mastoid process, the auricle is raised from theside of the head and directed towards the waves of sound whichstrike it from in front. The concave hearing-cups made of hardrubber are more efficacious, but are used only by women (Leiter,of Vienna). They act as sound-receivers, and are placed overthe edge of the auricle, being hidden by the hai::, cap or hat. On account of the great variety of instruments to aid thehearing, and their markedly different effect even in the sameindividual, it is advisable, in those cases in which the use ofone of these instruments is indicated, to try a number of them,and to select that one with which the patient hears the has already been mentioned that some patients with a high. Fig. 343. degree of deafness hear better without a hearing-trumpet—that is,by conduction of the waves of sound through the cranial bones. The number of deaf persons is very small who value the reliefin social intercourse so highly that they do not mind the un-pleasantness caused by the use of inconvenient and noticeablylarge hearing-trumpets. In spite of the advantage gained by theuse of larger instruments, they are far more often discarded onaccount of the attention which they attract. The ideal of all persons hard of hearing has always been a small instru-ment to aid the hearing, which could be worn unnoticed in the ear, andwhich would be as useful as the large hearing-trumpets. This problemhas not been solved up to the present, and will no doubt require sometime yet. The small hearing-trumpets which have been put on the market undermany different names, of which Abrahams, consisting of a short silver tubewith
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