Metronome with (pair of) mercury contacts

(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

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