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 it. My clock went too slow that day at noon by 2′2″, so that I ought to have added 1′2″ to the time of the clock, whereas I substracted as much from it. This is the reason of the difference in the times. The small variation in the distances of the limbs was owing to a stricter verification of the parts of my micrometer.

I am, with the most respectful esteem,

Gentlemen, Paris, Feb. 14, 1764. your most obedient,

humble servant,

Pingré. Rh