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Credit
Specification of Marc Antoine François Mannons : apparatus for ascertaining the presence and degree or cessation of vitality in the human body, &c. Public Domain Mark. Source: Wellcome Collection.
Patent for a device, the Dynamoscope, which "reposes on the theory that the degree of vital energy in animated beings is in direct ratio to the rapidity, intensity, and number of the vibrations of the nervous system". A little like a stethoscope.
| Location | Status | Access | |
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Closed stores Pat. vol. 28 |
| Location | Access | ||
|---|---|---|---|
Closed stores Pat. vol. 28:42 |