Signedstamped: E. ZIMMERMAN LEIPZIG
FunctionParts of a kymograph, an instrument for graphically recording physiological experiments.
Kymograph means "wave writer" in Greek. The wavy tracings on the paper recorded blood pressure, heart beats, respiration, electrical conduction of nerves, and other physiological and muscular changes that varied with time. Experimental psychologists used kymographs to record response times, muscle exertions, and physiological reactions that accompanied emotions.
The tracings enabled the study of phenomena that had previously been too fleeting and faint to measure. The graphs offered scientists a non-verbal language that could be understood across different disciplines. They also had a claim to objectivity, recording events solely through instruments rather than by human observation.
Related WorksC.H. Stoelting, Apparatus, Test and Supplies (Chicago, C.H.Stoelting Co, 1930) p.101 and p.103.