(Elektromagnetische Stimmgabel (direkten Zeitschreibung))
Description: A platinum contact is made and broken by a solenoid
to drive a tuning fork at 500 Hz. A clamp has been added to make
it easy to position against a kymograph. The higher arm of the
fork has a writing-bristle and traces
a time base on a kymograph that can be used for calibration. This
appears to carry out the measurement procedures used by Donders
in the 1860s (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. 48). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component, timing, response
Stimulus: N/A
System: N/A
Output: time measurement