Tigerstedt-style writing lever.

(Tigerstedtscher Schreibhebel.)
Description: A "light," "straw" writing lever (presumably a hollow metal tube) which has a low friction bearing which is moved when a muscle twitches. The lever also breaks the circuit which provided the electrical stimulus for the muscle twitch. There is also a second, adjustable, electrical wiring which connects to the muscle ?Hakel and to the lever attachment points. The holders for these components are made of hard rubber and can easily be placed adjacent to the kymograph drum. (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. 103). Leipzig: Eduard Zimmermann.

DESCRIPTORS:
Type: Component
Stimulus: Muscle movement
System: Recording
Output: Breaks circuit

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