{"id":5147,"date":"2024-09-22T14:12:12","date_gmt":"2024-09-22T14:12:12","guid":{"rendered":"https:\/\/www.betrisey.ch\/lultime-n27"},"modified":"2025-01-28T06:45:46","modified_gmt":"2025-01-28T06:45:46","slug":"lultime-n27","status":"publish","type":"page","link":"https:\/\/www.betrisey.ch\/en\/lultime-n27","title":{"rendered":"L’Ultime (n\u00b027)"},"content":{"rendered":"\n\n

Version 1: October 2024<\/strong><\/p>\n\n\n\n\n\n

Foucault pendulum \/ compass mounted on a cardan shaft and without a Charron friction ring, but with a Foucault brake ring underneath. A Charron ring was installed beforehand, but it can be rendered inoperative simply by moving it high enough.<\/p>\n\n\n\n

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Its suspension is different from all the others I’ve made so far: a steel point resting on a concave bed, also made of steel.<\/p>\n\n\n\n

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Another specification: the pendulum itself is an authentic compass<\/strong>! The arrow comes from a child’s compass, glued to the top of the pendulum. It permanently keeps the pendulum in the direction given by the Earth’s magnetism<\/strong>. Without it, the suspension would rotate on itself and inevitably hit the stop. The red part points south and the white part north.<\/p>\n\n\n\n

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This prototype worked first time without any adjustments. However, the suspension is not as reliable as a wire. So I decided to modify it and add the Charron ring. Here’s the final version:<\/p>\n\n\n\n\n\n

Version 2: November 2024<\/strong><\/p>\n\n\n\n\n\n