Audiometer
Everybody's Encyclopedia · 1912 · p. 2
or Audi meter, an instrument devised by Prof. Hughes, the inventor of the microphone. “2 inally its object was to measure wit precision the sense of hearing.
Bu kavram başka kaynaklarda da geçiyor
Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
Hawkins' Electrical Dictionary (1915)
The American Illustrated Medical Dictionary (1913)
Chamber's Twientieth Century Dictionary (1908)
The American Dictionary and Cyclopedia (1907)
Chandler's Encyclopedia (1898)
The Student's Medical Dictionary (1896)
The Standart Electrical Dictionary (1892)
An Illustrated Encyclopaedic Medical Dictionary (1891)
Nuttall's Standard Dictionary of the English Language (1890)
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