(Metronom mit Quecksilber-Kontakten)
Description: This is a metronome with a lever attached to the
pendulum.
Wires at each end dip into mercury-filled cups to close
electrical contacts that will not burn shut and may be used to
control other apparatus or stimuli. This provides precise
alternating at a specific rate up to several times per second.
(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. 44). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component, timing, stimulus
Stimulus: N/A
System: N/A
Output: N/A