(Schallschlüssel nach Römer, akustischer Reiz- und
Reaktionsapparat)
Description: This apparatus uses a diaphragm which is moved by a
the air pressure of a vocal sound. The solenoid is initially
closed. The apparatus is adjusted so that a tiny movement of the
diaphragm (made of wood which could be used for inlay, and thus
fine and thin) is amplified to open the solenoid and ring a bell.
(Expanded caption Copyright 1998, Edward J. Haupt)
(Source: Kraepelin, Psychiatrische Arbeiten, I, 4)
Source of illustration: Zimmermann, E. (1903). XVIII. Preis-
Liste über psychologische und physiologische Apparate
(p. 27). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: component
Stimulus: N/A
System: vocal
Output: switch closure