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April 24, 1948


JAMA. 1948;136(17):1099. doi:10.1001/jama.1948.72890340002009a

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Manufacturer: Aurex Corporation, 1117 North Franklin Street, Chicago 10.

This is a plastic cased hearing aid, with separate batteries. The crystal receiver supplied has the Aurex trademark and is connected to the amplifier by a plastic covered cord (plugs at both ends). A four conductor battery cord connects to the batteries used.

One sliding type control on the side of the case serves as the switch and volume control. A rotating fan-type shutter may be turned from the center front of the case to close the microphone openings and serves as a partial tone control.

Dimensions and Weight  Dimensions: 70 by 63 by 22 mm. (2¾ by 2½ by ⅞ inch),Weight: Unit alone, approximately. 92 Gm. (3¼ ounces). With batteries, approximately 269 Gm. (9½ ounces).

Acoustical Gain  Measurements were made of the acoustical gain of the instrument in decibels. This is the decibel difference in sound pressure between the

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