{"id":11286,"date":"2014-12-14T09:16:31","date_gmt":"2014-12-14T14:16:31","guid":{"rendered":"http:\/\/scruss.com\/blog\/?p=11286"},"modified":"2026-04-03T09:19:30","modified_gmt":"2026-04-03T13:19:30","slug":"gramophone-echoes","status":"publish","type":"post","link":"https:\/\/scruss.com\/blog\/2014\/12\/14\/gramophone-echoes\/","title":{"rendered":"Gramophone Echoes"},"content":{"rendered":"\n<figure class=\"wp-block-image aligncenter\"><a href=\"http:\/\/scruss.com\/wordpress\/wp-content\/uploads\/2014\/12\/gramophone_echoes.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"672\" src=\"http:\/\/scruss.com\/wordpress\/wp-content\/uploads\/2014\/12\/gramophone_echoes-1024x672.jpg\" alt=\"gramophone echoes\" class=\"wp-image-11287\" srcset=\"https:\/\/scruss.com\/wordpress\/wp-content\/uploads\/2014\/12\/gramophone_echoes-1024x672.jpg 1024w, https:\/\/scruss.com\/wordpress\/wp-content\/uploads\/2014\/12\/gramophone_echoes-160x105.jpg 160w, https:\/\/scruss.com\/wordpress\/wp-content\/uploads\/2014\/12\/gramophone_echoes-320x210.jpg 320w, https:\/\/scruss.com\/wordpress\/wp-content\/uploads\/2014\/12\/gramophone_echoes.jpg 1632w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>Inspired by Robert Howsare\u2019s <em><a href=\"https:\/\/web.archive.org\/web\/20201125104240\/http:\/\/roberthowsare.com\/rational-aesthetics\/drawing-apparatus\/\">Drawing Apparatus<\/a><\/em>, a time-step simulation of a similar apparatus was developed. Each trace was made of thousands of straight line segments, one for each rotation of the turntables\u2019 drive motors, and enough to create a closed figure. Suitable gearing was modelled to simulate standard (North American) gramophone speeds of 16\u2154, 33\u2153, 45 and 78\u2155 rpm for each of the turntables. Drive crank lengths were derived from standard record sizes. The initial starting angle of each turntable was also modelled.<\/p>\n\n\n\n<p>Three simulation runs were chosen and superimposed. The result was plotted on \u201cA\u201d size vellum using 0.3 mm ceramic drafting pens. Total plot time&nbsp; at 90 mm\/s: 22 minutes.<\/p>\n\n\n\n<p>Code available on request.<\/p>\n\n\n\n<p>(update, 2026: Code available on request <em>if I can find it<\/em>. I have implemented this project from scratch at least three different times because I forgot I&#8217;d done it before. You might say I&#8217;m forgetful, but I say I get 3\u00d7 the joy of discovery this way \u2026)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Inspired by Robert Howsare\u2019s Drawing Apparatus, a time-step simulation of a similar apparatus was developed. Each trace was made of thousands of straight line segments, one for each rotation of the turntables\u2019 drive motors, and enough to create a closed figure. Suitable gearing was modelled to simulate standard (North American) gramophone speeds of 16\u2154, 33\u2153, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[2],"tags":[705,2855,2856,2789],"class_list":["post-11286","post","type-post","status-publish","format-standard","hentry","category-goatee-stroking-musing-or-something","tag-art","tag-circlon","tag-harmonograph","tag-plotter"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pQNZZ-2W2","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/posts\/11286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/comments?post=11286"}],"version-history":[{"count":5,"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/posts\/11286\/revisions"}],"predecessor-version":[{"id":18080,"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/posts\/11286\/revisions\/18080"}],"wp:attachment":[{"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/media?parent=11286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/categories?post=11286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scruss.com\/blog\/wp-json\/wp\/v2\/tags?post=11286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}