(Elektromagnetische Stimmgabel (direkten Zeitschreibung))
Description: A platinum contact is made and broken by a solenoid
to drive a tuning fork at 50, 100, or 250 Hz. Different from No.
170 in that the platinum contact completes the circuit by dipping
into a mercury pot. A clamp has been added to make it easy to
position against a kymograph. The higher arm of the fork has a
bristle (as in a brush made of bristles) which traces a line on
the kymograph that acts as a time base for calibration. (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. 47). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component, timing, response
Stimulus: N/A
System: N/A
Output: time measurement