E267 -- Extrait d'une lettre de M. Euler ecrite a M. Du Hamel le 3 Fevrier 1756

(Extract of a letter of M. Euler written to M. Duhamel, 3 February 1756)


According to Eneström, this is “sur la perfection des lunettes”

According to a note on p. 214, it was presented to the St. Petersburg Academy on March 6, 1757.

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