{"id":470,"date":"2013-07-01T21:18:36","date_gmt":"2020-02-18T06:53:26","guid":{"rendered":"https:\/\/redfrontdoor.org\/blg2\/?p=470"},"modified":"2020-02-19T15:52:35","modified_gmt":"2020-02-19T15:52:35","slug":"post-464","status":"publish","type":"post","link":"https:\/\/redfrontdoor.org\/blog\/?p=470","title":{"rendered":"A Lego escapement (and failed slow-motion)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I recently came across a <a href=\"http:\/\/makezine.com\/2010\/10\/04\/macdowall-single-pin-escapement-in\/\">post on the Makezine blog<\/a> showing a video of a very pleasing mechanism, the MacDowall single-pin escapement. Zach and I recreated it as best we could, although we didn&#8217;t go as good a job as the original when it came to a rigid support structure. Nevertheless, our copy worked:<\/p>\n\n\n\n<figure style=\"max-width:480px;margin:auto;\" class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Lego escapement, replication of one by &#039;horolophile&#039;\" width=\"910\" height=\"683\" src=\"https:\/\/www.youtube.com\/embed\/r7OaMeFE_ac?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">My other aim with this was to experiment with temporal aliasing, to create a slow-motion version of the mechanism. For this to work, I would make a video by taking, say, every 61st frame of the original video. Since the pendulum&#8217;s period is very unlikely to be an exact multiple of the frame time, I would get a strobe effect and see the mechanism in slow motion. Alas, the fates conspired against me, and my pendulum had a period indistinguishable from (58\/29.97)\u2033, as this composite image shows. It&#8217;s the average of 154 images, each 58 frames apart from the next:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"\/blog\/wp-content\/uploads\/2013\/07\/every-58.jpg\" alt=\"\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">For contrast, here&#8217;s the average of 154 images, each 57 frames apart from the next (left), and every 59 (right):<\/p>\n\n\n\n<figure class=\"wp-block-gallery aligncenter columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"240\" height=\"360\" src=\"\/blog\/wp-content\/uploads\/2013\/07\/every-57.jpg\" alt=\"\" data-id=\"1782\" data-full-url=\"\/blog\/wp-content\/uploads\/2013\/07\/every-57.jpg\" data-link=\"\/blog\/?attachment_id=1782\" class=\"wp-image-1782\" srcset=\"https:\/\/redfrontdoor.org\/blog\/wp-content\/uploads\/2013\/07\/every-57.jpg 240w, https:\/\/redfrontdoor.org\/blog\/wp-content\/uploads\/2013\/07\/every-57-200x300.jpg 200w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"240\" height=\"360\" src=\"\/blog\/wp-content\/uploads\/2013\/07\/every-59.jpg\" alt=\"\" data-id=\"1788\" data-full-url=\"\/blog\/wp-content\/uploads\/2013\/07\/every-59.jpg\" data-link=\"\/blog\/?attachment_id=1788\" class=\"wp-image-1788\" srcset=\"https:\/\/redfrontdoor.org\/blog\/wp-content\/uploads\/2013\/07\/every-59.jpg 240w, https:\/\/redfrontdoor.org\/blog\/wp-content\/uploads\/2013\/07\/every-59-200x300.jpg 200w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">By the time I discovered this, I had dismantled the pendulum. Grr.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I recently came across a post on the Makezine blog showing a video of a very pleasing mechanism, the MacDowall single-pin escapement. Zach and I recreated it as best we could, although we didn&#8217;t go as good a job as the original when it came to a rigid support structure. Nevertheless, our copy worked: My other aim with this was to experiment with temporal aliasing, to create a slow-motion version of the mechanism. For this to work, I would make a video by taking, say, every 61st frame of the original video. Since the pendulum&#8217;s period is very unlikely to be an exact multiple of the frame time, I would get a strobe effect and see the mechanism in slow<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-470","post","type-post","status-publish","format-standard","hentry","category-uncategorized","comments-off"],"_links":{"self":[{"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/470","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=470"}],"version-history":[{"count":4,"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/470\/revisions"}],"predecessor-version":[{"id":3760,"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/470\/revisions\/3760"}],"wp:attachment":[{"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=470"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=470"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/redfrontdoor.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}