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Abraham-Louis Breguet

physics
Jean-Charles-Athanase-Peltier and the Peltier Effect

Jean-Charles-Athanase-Peltier and the Peltier Effect

Harald Sack
On October 27, 1845, French physicist Jean Charles Athanase Peltier passed away. Peltier is best known today for the introduction of the eponymous Peltier effect, a thermoelectrical effect, i.e. the presence of heating or cooling at an electrified junction of two different conductors, as well as for the electrostatic induction. Jean Charles Athanase Peltier – Early Years as Clockmaker Peltier was born to a poor family; his father earned a living as a…
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engineering
The Ingenious Watches of Abraham-Louis Bréguet

The Ingenious Watches of Abraham-Louis Bréguet

Harald Sack
On January 10, 1747, Swiss horologist Abraham-Louis Breguet was born. In his lifetime he was considered the leading watchmaker of his day because of his artistic as well as technical skill. His innovations included a self-winding or “perpétuelle” watch (1780), the gong spring which decreased the size of repeater watches, and the first anti-shock device or “pare-chute“, which improved the reliability of his watches while making them less fragile. Of course Swiss watches…
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