Electromagnetic tuning fork

(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

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