(Episkotister)
Description: This rotating wheel with variable shutter is used to
interrupt a light beam with a variable on / off ratio. The wheel
can be driven by a belt traveling around the grooved outer edge.
This same apparatus is also shown on p. 25 of the 1930
Stoelting Catalog. (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. 8). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component
Stimulus: colored, gray, or patterned disks
System: vision
Output: N/A