Editing Audiometry (section)

===Mechanical "acuity meters" and tuning forks===
For many years there was desultory use of various devices capable of producing sounds of controlled intensity. The first types were clock-like, giving off air-borne sound to the tubes of a stethoscope; the sound distributor head had a valve that could be gradually closed. Another model used a tripped hammer to strike a metal rod and produce the testing sound; in another, a tuning fork was struck.
The first such measurement device for testing hearing was described by Wolke (1802).<ref>{{cite journal |last1=Feldmann |first1=H |title=[History of instrumental measuring of hearing acuity: the first acumeter]. |journal=Laryngo- Rhino- Otologie |date=September 1992 |volume=71 |issue=9 |pages=477–82 |doi=10.1055/s-2007-997336 |pmid=1388477|s2cid=260205193 }}</ref>