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Sphygmograph

Sphygmograph.jpg Manometer for measuring Blood-PressureThumbnailsSir Isaac Newton's House, Orange and St. Martin's StreetsManometer for measuring Blood-PressureThumbnailsSir Isaac Newton's House, Orange and St. Martin's StreetsManometer for measuring Blood-PressureThumbnailsSir Isaac Newton's House, Orange and St. Martin's Streets

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
Keywords
human, Medicine
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