{"id":290,"date":"2012-11-15T22:27:03","date_gmt":"2012-11-15T21:27:03","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=290"},"modified":"2025-01-14T18:07:35","modified_gmt":"2025-01-14T17:07:35","slug":"letrange-destin-dun-des-plus-grand-telescope-amateur-au-monde-le-875mm-damiens","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/letrange-destin-dun-des-plus-grand-telescope-amateur-au-monde-le-875mm-damiens\/","title":{"rendered":"L&rsquo;\u00e9trange destin d&rsquo;un des plus grand t\u00e9lescope amateur au monde, le 875mm d&rsquo;Amiens"},"content":{"rendered":"\n<p><a href=\"https:\/\/reperes-astro.fr\/?p=80\" target=\"_blank\" rel=\"noopener\">Dans un article pr\u00e9c\u00e9dent<\/a>, nous \u00e9voquions, gr\u00e2ce \u00e0 un billet d&rsquo;A. Le Boeuffle, l&rsquo;existence \u00e0 Amiens d&rsquo;un des plus grand t\u00e9lescope jamais r\u00e9alis\u00e9 par un amateur : celui de M. Caudron, de 875 mm \u00e0 F\/D 10 (donc pr\u00e8s de 9m de focale) install\u00e9 en centre ville dans les ann\u00e9es 30. Gr\u00e2ce aux informations envoy\u00e9es par un internaute, M. Naillon, nous en savons maintenant bien plus sur ce t\u00e9lescope hors norme et sur ses aventures apr\u00e8s le rachat du miroir par <a href=\"http:\/\/bourge.pagesperso-orange.fr\/pierre\/\" target=\"_blank\" rel=\"noopener\">Pierre Bourge<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><figure><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2012\/11\/caudron.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft  wp-image-311\" style=\"border: 0px none; margin: 10px;\" title=\"caudron\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2012\/11\/caudron-746x1024.jpg\" alt=\"\" width=\"403\" height=\"553\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2012\/11\/caudron-746x1024.jpg 746w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2012\/11\/caudron-219x300.jpg 219w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2012\/11\/caudron.jpg 750w\" sizes=\"auto, (max-width: 403px) 100vw, 403px\" \/><\/a><\/figure><\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Des d\u00e9tails sur l&rsquo;instrument<\/h3>\n\n\n\n<p>C&rsquo;est au cours d&rsquo;une visite d&rsquo;une usine Saint Gobain que M. Caudron eut l&rsquo;opportunit\u00e9 de r\u00e9cup\u00e9rer un disque d&rsquo;essai de 90cm de diam\u00e8tre qui devait \u00eatre refondu. Gr\u00e2ce aux conseils d&rsquo;<a href=\"http:\/\/fr.wikipedia.org\/wiki\/Andr%C3%A9_Couder\" target=\"_blank\" rel=\"noopener\">Andr\u00e9 Couder<\/a>, du laboratoire d&rsquo;optique de l&rsquo;Observatoire de Paris, M. Caudron r\u00e9ussit l&rsquo;exploit de creuser, doucir puis polir cette pi\u00e8ce de verre, en lui donnant une focale de 9m, ce qui pr\u00e9sentait l&rsquo;avantage de ne n\u00e9cessit\u00e9 qu&rsquo;une surface sph\u00e9rique, plus facile \u00e0 obtenir. Il a fallu 900 heures de travail, dont 300 de contr\u00f4le \u00e0 l&rsquo;aide d&rsquo;un appareil de Foucault pour obtenir le r\u00e9sultat souhait\u00e9.<\/p>\n\n\n\n<p>Une fois le miroir plac\u00e9 dans un tube de 10m de long, l&rsquo;ensemble fut install\u00e9 sur une monture \u00e9quatoriale en berceau compos\u00e9e de poutrelles en fer de 30cm de largeur, le berceau reposant lui-m\u00eame sur des poutrelles de 4m de haut, le tout juch\u00e9 sur une dalle en b\u00e9ton surmontant un ensemble de garages ! Le poids total avoisinait les 1,6 tonnes.<\/p>\n\n\n\n<p>Pour observer, il fallait monter sur une plateforme situ\u00e9e \u00e0 8m de haut. Or, le propri\u00e9taire, \u00e9tant sujet au vertige, n&rsquo;utilisa finalement qu&rsquo;assez peu l&rsquo;instrument, et c&rsquo;est surtout <a href=\"http:\/\/fr.wikipedia.org\/wiki\/Andr%C3%A9_Le_B%C5%93uffle\" target=\"_blank\" rel=\"noopener\">A. Le Boeuffle<\/a> qui proc\u00e9dait aux observations. D&rsquo;autre part, les observations en plein air \u00e9taient souvent g\u00ean\u00e9es par le vent, particuli\u00e8rement en haut du fameux escalier.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Qu&rsquo;est devenu le miroir&nbsp; ?<\/h3>\n\n\n\n<p>A la mort de M. Caudron, sa veuve demanda \u00e0 Pierre Bourge de d\u00e9monter l&rsquo;instrument, une op\u00e9ration bien difficile en elle-m\u00eame. Il r\u00e9cup\u00e9ra \u00e9galement un 410mm qui \u00e9tait install\u00e9 sous une coupole m\u00e9tallique en haut de la maison des Caudron. Le miroir du grand t\u00e9lescope avait \u00e9t\u00e9 ab\u00eem\u00e9 par un observateur malhabile avant son d\u00e9montage. Il \u00e9tait donc n\u00e9cessaire de le retailler et de le repolir.<\/p>\n\n\n\n<p>Pierre Bourge signa (\u00e0 la fin des ann\u00e9es 80 ?) un pr\u00eat \u00e0 bail avec l&rsquo;association A.B.C.D.E. gestionnaire de l&rsquo;<a href=\"http:\/\/www.astro-blieux.fr\/V3\/fr\/observatoire\/astronomie-verdon.php\" target=\"_blank\" rel=\"noopener\">observatoire du Mont Chiran<\/a> dans les Alpes de Haute Provence. Le miroir devait \u00eatre retaill\u00e9 et poli par Patrick Lagrange de fa\u00e7on \u00e0 lui donner une F\/D de 4.<\/p>\n\n\n\n<p>Voil\u00e0 o\u00f9 nous en sommes pour le moment en ce qui concerne l&rsquo;histoire de ce t\u00e9lescope. Le site Internet de l&rsquo;observatoire du Mont Chiran ne mentionne pas un tel t\u00e9lescope. L&rsquo;association a repris ce site du CNRS en 1989 et dispose de nos jours d&rsquo;un t\u00e9lescope de 300mm. Pas d&rsquo;informations non plus sur le t\u00e9lescope entre le d\u00e9montage en 1969-1973 et ce projet r\u00e9cent.<\/p>\n\n\n\n<p>Si des lecteurs disposent d&rsquo;information \u00e0 ce sujet, je les remercie de prendre contact avec l&rsquo;association.<\/p>\n\n\n\n<p>Documentation :<\/p>\n\n\n\n<p>&#8211; Revue Astro-Ciel, mars-avril 1993<\/p>\n\n\n\n<p>&#8211; Ciel et Fus\u00e9es, d\u00e9cembre 1969<\/p>\n\n\n\n<p>&#8211; Pierre Bourge, <a href=\"http:\/\/bourge.pagesperso-orange.fr\/pierre\/accueil.htm#\" target=\"_blank\" rel=\"noopener\">M\u00e9moires d&rsquo;un chasseur d&rsquo;\u00e9toiles<\/a>, 1998, p.109-112.\u00a0<\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_290\" class=\"pvc_stats all  \" data-element-id=\"290\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Dans un article pr\u00e9c\u00e9dent, nous \u00e9voquions, gr\u00e2ce \u00e0 un billet d&rsquo;A. Le Boeuffle, l&rsquo;existence \u00e0 Amiens d&rsquo;un des plus grand t\u00e9lescope&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_290\" class=\"pvc_stats all  \" data-element-id=\"290\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":6,"featured_media":311,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103,102,5],"tags":[],"class_list":["post-290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archives-reperes-astro-2012","category-archives-reperes-astro","category-documentation"],"a3_pvc":{"activated":true,"total_views":47,"today_views":0},"yoast_head":"<title>L&#039;\u00e9trange destin d&#039;un des plus grand t\u00e9lescope amateur au monde, le 875mm d&#039;Amiens - Rep\u00e8res Astro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reperes-astro.fr\/letrange-destin-dun-des-plus-grand-telescope-amateur-au-monde-le-875mm-damiens\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L&#039;\u00e9trange destin d&#039;un des plus grand t\u00e9lescope amateur au monde, le 875mm d&#039;Amiens - Rep\u00e8res Astro\" \/>\n<meta property=\"og:description\" content=\"Dans un article pr\u00e9c\u00e9dent, nous \u00e9voquions, gr\u00e2ce \u00e0 un billet d&rsquo;A. 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