(Federsignal)
Description: This is a pen which can magnify (up to 20 times) the
movement of an electromagnetically driven tuning fork. It has the
smallest possible disruptive effect on the tuning fork, since its
spring cannot affect the movement of the tuning fork. (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. 50). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component, timing, response
Stimulus: N/A
System: N/A
Output: time