File:MIH-film31jpg.jpg

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English: Master pendulum tank of a Shortt Synchronome astronomical regulator clock, the most accurate pendulum clock ever manufactured, invented by William Hamilton Shortt in 1921, in Musée International d'Horlogerie, La Chaux-De-Fonds, Switzerland. This kept time with two pendulums; the master pendulum shown here and a slave pendulum in a nearby clock unit electrically connected to it. The copper tank was evacuated to 20 mm Hg to reduce aerodynamic drag on the invar master pendulum, increasing its accuracy by 4 times. The clock had an accuracy of considerably better than 1 second per year.
Français : Musée International d'Horlogerie, La Chaux-De-Fonds, Suisse.
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Author Rama.
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current23:55, 27 September 2006Thumbnail for version as of 23:55, 27 September 20061,429 × 2,191 (400 KB)Rama (talk | contribs){{fr|Musée International d'Horlogerie, La Chaux-De-Fonds, Suisse}} {{en|Musée International d'Horlogerie, La Chaux-De-Fonds, Switzerland}} Work by Rama {{self2|CeCILL|Cc-by-sa-2.0-fr}} Category:Musée international d'horlogerie

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