Stool
Museums and archives
Until 1933 mechanism was stored in the Science Museum (London, UK); № 1877-440.
Research
A. B. Kempe. How to draw a straight line. A lecture on linkages. — London, 1877.
Other sources
Document, stored in the Science Museum (London, UK).
D. A. Grave. Encyclopedia of elementary mathematics. An essay on its contemporary state. — Kiev: Edition of N. Ya. Ogloblin’s book store, 1912. (Russian)
Description
Stool with top moving parallel to it's bottom.
The only known image of this mechanism was found in the book "How to draw a straight line. A lecture on linkages." by A. B. Kempe.
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