Identifier: adjacendis00poli (find matches)
Title: A text-book of the diseases of the ear and adjacent organs
Year: 1894 (1890s)
Authors: Politzer, Adam, 1835-1920 Dodd, Oscar Dalby, William B. (William Bartlett), Sir, 1840-1918
Subjects: Ear Diseases
Publisher: Philadelphia : Lea Brothers & Co.
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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hearing-tube,with a movable tip on the end for the external meatus. The instru-ment has the advantage that the larger portion made of hard rubbercan be put in the side pocket, so that it is less conspicuous thanother instruments of this kind. Within the last few years smallerinstruments have been made on the same principle, connected with HEARING-INSTRUMENTS FOR THE DEAF. 709 the upper end of a cane (Leiter) or umbrella, in order to rendertheir use less noticeable. The so-called otophone is only of little value. It consists of twobent strips of spring metal, by laying which on the mastoid processthe auricle is raised from the surface of the head, and directedtowards the waves of sound which come from in front. The con-cave hearing-vessels made of hard rubber (Leiter) are more useful,but are, however, only used by women. The sound-condenser isplaced above the edge of the auricle, and may be hidden by thehair, cap, or hat. From the great variety of hearing-instruments and their markedly
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Fig. 327. Fig. 328. Fig. 329. different effects in one and the same individual, in any case in whichsuch an instrument is required it is best to let the patient try anumber of them, and then choose the one with which he hears best.It has already been mentioned that many persons very dull ofhearing can hear better without an ear-trumpet, therefore throughthe bones of the head, than with one. The number of those who prize ease of social intercourse sohighly that they pay no regard to the discomfort and conspicuous-ness of large ear-trumpets is very small. Notwithstanding theadvantages possessed by large instruments, they are generally dis-carded on account of conspicuousness in use. The ideal of all deaf people has always been a small instrument whichcould be worn unobservedly in the ear, and render at the same time the same 710 HEARING-INSTRUMENTS FOR THE DEAF. sen-ice as the largest instrument. This problem has not yet been solved, andwill not be so easily. The small instruments, reco

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