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February 1956


Author Affiliations

Los Angeles

AMA Arch Otolaryngol. 1956;63(2):211. doi:10.1001/archotol.1956.03830080097023

There has long been need for a small compact portable air conduction testing device that can be used in the home, hospital, and operating room (stapes mobilization). Such an instrument may also be of value in industry and for clinicians working in fields other than otolaryngology.

With this in mind certain specifications which I suggested were incorporated in an air conduction testing device known as on "Otometer." The specifications are as follows:

Frequencies: Sine wave tones of 500, 1000, 2000, 4000, and 6000 cps are available with an accuracy within ± 5%.

Tone interrupter: A momentary "on" switch with a bear knob is incorporated as a fastacting interrupter switch, and the circuit is designed in a manner that no transient or extraneous frequencies are emitted when the tone interrupter switch is operated.

Otometer for air conduction testing.

Panel meter: A meter is incorporated in the Otometer with push buttons and

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