The percentage registration of the sensitiveness of the conductive apparatus of the ear to resonant impulses of minimum intensity / by A.D. Stewart.

  • Stewart, A. D., M.B.
Date:
[1879]
Catalogue details

Licence: Public Domain Mark

Credit: The percentage registration of the sensitiveness of the conductive apparatus of the ear to resonant impulses of minimum intensity / by A.D. Stewart. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    THE PERCENTAGE REGISTRATION OF THE SENSI- TIVENESS OF THE CONDUCTIVE APPARATUS OF THE EAR TO RESONANT IMPULSES OF MINIMUM INTENSITY. By a. D. STEWART, M.B., Aural Surgeon to the Glasgow Public Dispensary. d {Read in the Medico-Ohirurgical Society, ^4th January, 1879). Deafness occurs (1), when the transmission of resonant im- pulses by the several parts of the conductive apparatus of the ear is prevented or impeded; (2), when the resonant impulses, being transmitted, fail to excite a sensation of sound, or its perception, from defects in the nervous apparatus. In the examination of a case in which more or less deafness is the prominent symptom, the first object must therefore be to determine to what extent, if any, the conductive portion of the auditory apparatus is responsible for the existing deafness. The sensitiveness of the conductive apparatus, in virtue of which that apparatus is influenced by, and transmits resonant impulses of low intensity, is strictly proportional to the inertia of the mass of the apparatus; so that, if the inertia be increased by changes which have taken place in and around the conduc- tive apparatus, the consequent loss of sensitiveness will be indicated by the proportionate rise in the intensity required. Hence, by means of the minimum intensity of sound required to overcome the inertia, the sensitiveness of the conductive apparatus may be ascertained, and the amount of any loss thereof determined by comparing the minimum intensity found to be necessary, with that required when the sensitive-