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ASTRONOMY - WATCHMAKING. BRÉGUET, Louis (1804–1883), French watchmaker and physicist. Signed autograph letter addressed to Maurice MAINDRON (1857–1911), French entomologist and naturalist, “secretary of the Commission on the Transit of Venus.” Paris, March 19, 1875. 1 p. in-8. “The bearer of this letter is my son [the physicist Antoine Bréguet].” He requests the money owed to him, 1,700 francs, “on the lovely Lady Venus.” During the 1874 mission to observe the transit of Venus, the Breguet company had provided a high-precision astronomical pendulum to ensure perfect time measurements. Louis Breguet had also co-designed Jules Janssen’s “photographic revolver,” a revolutionary device that captured the oldest chronophotographic animation in history.
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