(Optische Bank nach von Frey)
Description: This stand allows various instruments to be mounted
precisely along the same optical axis. The instruments allow
control of visual density (and thus stimulus intensity), size of
stimuli, color cancellation, and the use of pointers. (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. 18). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: research
Stimulus: light sources
System: vision
Output: judgment of equality or difference