(Hörschärfprüfer nach Zoth)
Description: A steel ball (3.2, 6.4, or 9.6 mm dia.) is
electrically or mechanically dropped onto a flat steel surface
producing different calibrated intensities of sound to test a
subject's auditory acuity. (Expanded caption Copyright 1998,
Edward J. Haupt)
(Source: None given.)
Source of illustration: Zimmermann, E. (1903). XVIII. Preis-
Liste über psychologische und physiologische Apparate
(p. 30). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: tester
Stimulus: sound of varying intensity
System: audition
Output: recognition