Hugh Hetherington Hearing Aid Museum
Hugh Hetherington Hearing Aid Museum

The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

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Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.


Ear Trumpets (Ear Horns)

R. J. Dowling Model OL-332 "Banjo" Ear Trumpet (Ear Horn)

This ear trumpet was made by R. J. Dowling of London for Medresco as indicated by its model number OL-332.

The parabolic reflector measured 4⅝" in diameter and focused the collected sound into the tube running to the ear.

This ear trumpet is made of japanned metal and measures 17¾" in length when extended and 11½" when collapsed. The weight of this ear trumpet is 6.8 oz.

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R. J. Dowling's Medresco Model OL-332  ear trumpet seen from the back in its collapsed (carrying) position.


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This ear trumpet extended for use, (although it worked just as well in its collapsed position). Here it is seen from the front in its extended position.


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Close-up of the ear tip. It is made of black plastic and screwed onto the end of the metal tube.


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The name, date and model number are stamped into the front of the tube in the bowl. It reads "R.J. DOWLING LONDON  12 (up arrow) 49 OL-332.

R. J. Dowling manufactured these ear trumpets in London England.

This ear trumpet was made in December, 1949 for the Ministry of War (indicated by the "up arrow") under the auspices of  Medresco (Medical Research Council), and distributed by the British Health Services. All Medresco models began with the letters "OL".

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