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A, An ivory button which is pressed on the skin over the radial artery by a metal spring.
B, A continuous screw which works against the cogwheel
C. By rotating B, the lever
D is raised to a position in which its point scratches the travelling-plate
E (covered with blackened paper).
F, A box containing clockwork which moves E.
G, A screw by means of which the pressure of the spring is adjusted to the force of the pulse.

Author

The Body at Work
by Alexander Hill
Published 1908
Available from gutenberg.org

Posted on

Tuesday 1 September 2020

Dimensions

900*282

Tags

human, Medicine

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• Technology

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