(Plethysmograph nach Lehmann.)
Description: Then as now a plethysmograph was a device for
transducing changes of volume (in this case into air pressure
changes) which could then be recorded as changes over time. When
an arm or other limb is placed in the plethysmograph, it can be
used to show volumetric flow per unit time. In this unit, the
volume changes are registered in a leather arm cuff secured by a
chain. (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. 91). Leipzig: Eduard Zimmermann.
DESCRIPTORS:
Type: Component
Stimulus: Volume change
System: N/A
Output: Volumetric change