(Electromagnetische Stimmgabel)
Description: A platinum contact is made and broken by a solenoid
to drive a tuning fork at 50, 100, or 250 Hz. The repetitive
pulses are counted and a time is calculated by the number of
cycles and fractional parts of cycles which are inscribed on the
kymograph drum. This was the time recording method, considerably
cheaper than a Hipp chronograph, which was used by Donders
(1867?) to measure reaction time in his experiment which
determined the components of reaction time by subtraction of the
durations of different procedures. (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. 46). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component, timing, response
Stimulus: N/A
System: N/A
Output: time