Wundt-style kymograph for experimental plethysmography.

(Kymographion nach Wundt zu plethysmographischen versuchen.)
This kymograph is claimed to suitable for plethysmographical experiments since it is absolutely soundless. It can run up to a speed of 100 mm/sec, and thus complete a record in 5 seconds or move more slowly. The speed regulation is through settable wind-vanes, through changing the friction drive (which appears to be much smaller than typical for a Baltzar-type kymograph), and through placement of weights (on shafts connected to the spring motor?). Vertical arrow-marks can be placed at any point on the record through a sled-like holder which can be moved up or down to any point on the 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. 65). Leipzig: Eduard Zimmermann.

DESCRIPTORS:
Type: component
Stimulus: marker and plethysmographic signals
System: N/A
Output: Extended graphical record of continuous amplitude