A photopotentiometric transducer for detecting in vitro muscle contractions

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Abstract
In vitro muscle contractions can be detected and recorded by using a light-sensitive solid-state potentiometer as a transducer. The amount of light reaching the photosensitive potentiometer is controlled by movement of a shield across the potentiometer in response to muscular contractions. The apparatus is relatively frictionless, sensitive, inexpensive, and needs little or no amplification when the signal is transmitted to ordinary recorders. photosensitive solid-state potentiometer; frictionless transducer; Schultz-Dale reaction; hypersensitivity; anaphylaxis Submitted on August 10, 1964