|Letter, regarding theories about equilateral triangles by unknown author
|11 March 1671
|Letter in French with a suggestion for a solution for finding the centre of the movement of a pendulum ('le centre d'agitation d'un funipandule').
Includes one diagram in text.
Subject: Geometry / Natural Philosophy
Written at Lyon [France].
|Ink on paper
|View item on Science in the Making
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