Both Cassini and Mecain & Delambre talk about a geometrical foot that is one 6000th of a minute of arc. Cassini brings it up in
De la Grandeur et de la Figure de la Terre. Mecain & Delambre mention it in the
Preliminary Discussion of Base du Systeme Metrique, Vol. 1. The latter also cites an earlier article by Gabriel Mouton in
Observationes diametrorum (1670).
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