{"id":5050,"date":"2024-12-24T09:46:58","date_gmt":"2024-12-24T09:46:58","guid":{"rendered":"https:\/\/www.betrisey.ch\/pendule-de-foucault-n30-et-de-bravais-10"},"modified":"2025-01-28T08:45:02","modified_gmt":"2025-01-28T08:45:02","slug":"pendule-de-foucault-n30-et-de-bravais-10","status":"publish","type":"page","link":"https:\/\/www.betrisey.ch\/en\/pendule-de-foucault-n30-et-de-bravais-10","title":{"rendered":"Foucault (30) and Bravais (10) pendulums"},"content":{"rendered":"\n\n<p><\/p>\n\n\n\n\n\n<p><\/p>\n\n\n\n\n\n<p>2.06-metre pendulum with gimbal suspension and inverted propulsion: this time the propulsion magnets are located below the electromagnet coil, rather than on top as usual.<\/p>\n\n\n\n<div class=\"wp-block-image\">\n\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"528\" height=\"1024\" src=\"https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan-528x1024.jpg\" alt=\"\" class=\"wp-image-5046\" srcset=\"https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan-528x1024.jpg 528w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan-155x300.jpg 155w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan-768x1489.jpg 768w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan-792x1536.jpg 792w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan-1056x2048.jpg 1056w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/suspension-cardan.jpg 1301w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \/><\/figure>\n<\/div>\n\n\n\n\n<p class=\"has-text-align-center\">Cardan joint <\/p>\n\n\n\n\n\n<p><\/p>\n\n\n\n\n\n<p><\/p>\n\n\n\n\n\n<p>The ellipse correction is once again a self-centring floating ring made of two hard disks resting on a bed of microbeads and placed 2\/3 of the way up the pendulum. The Foucault \/ Bravais function is achieved by changing the magnets.<\/p>\n\n\n\n<div class=\"wp-block-image\">\n\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/aimants-1024x768.jpg\" alt=\"\" class=\"wp-image-5044\" srcset=\"https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/aimants-1024x768.jpg 1024w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/aimants-300x225.jpg 300w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/aimants-768x576.jpg 768w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/aimants-1536x1152.jpg 1536w, https:\/\/www.betrisey.ch\/wp-content\/uploads\/2025\/01\/aimants-2048x1536.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n\n\n<p class=\"has-text-align-center\">(Different prototypes of magnets used to propel the pendulum)<\/p>\n\n\n\n\n\n<p>The electromagnet, its control electronics and the battery are located directly on the pendulum.<\/p>\n\n\n\n\n\n<p>CW clockwise rotation: 2.879412 seconds<\/p>\n\n\n\n\n\n<p>CCW counter-clockwise rotation: 2.879546 seconds<\/p>\n\n\n\n\n\n<p>Difference: 0.00013 seconds<\/p>\n\n\n\n\n\n<div style=\"height:27px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n\n\n<p class=\"has-vivid-red-color has-text-color has-link-color wp-elements-a931335c2d44387c77a7482e083a6c92\"><\/p>\n\n\n\n\n\n<p><\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>2.06-metre pendulum with gimbal suspension and inverted propulsion: this time the propulsion magnets are located below the electromagnet coil, rather than on top as usual. Cardan joint The ellipse correction is once again a self-centring floating ring made of two hard disks resting on a bed of microbeads and placed 2\/3 of the way up [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-5050","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/pages\/5050","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/comments?post=5050"}],"version-history":[{"count":4,"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/pages\/5050\/revisions"}],"predecessor-version":[{"id":5225,"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/pages\/5050\/revisions\/5225"}],"wp:attachment":[{"href":"https:\/\/www.betrisey.ch\/en\/wp-json\/wp\/v2\/media?parent=5050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}