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October 1934

THE ACOUSTIMETER: A Device of Tuning Forks with a Graphic System for Charting Acuity of Hearing

Arch Otolaryngol. 1934;20(4):571-575. doi:10.1001/archotol.1934.03600040127010

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It has been my objective to accomplish the following: (1) to devise a system of charting acuity of hearing by means of tuning forks; (2) to construct the mechanical means that will eliminate the examiner's ear in the test; (3) to make the device simple and free of all electrical and intricate elements, and to avoid bone or tissue conduction of sound to the examined ear, thus obviating erroneous records from this source; (4) to construct the device so that it may be produced inexpensively.

MECHANISM  The acoustimeter is an arrangement of tuning forks in series, mounted on a revolving base. A turn brings each fork into position to be struck by a hammer centrally mounted to serve all the forks. The hammer is actually a pendulum weighted on the free end. A stop-watch is connected with the pivotal end of the pendulum. When the hammer is released the watch

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