{"id":30402,"date":"2022-07-25T18:22:57","date_gmt":"2022-07-25T16:22:57","guid":{"rendered":"http:\/\/lyonbondyblog.fr\/LBB\/?p=30402"},"modified":"2022-07-25T18:23:00","modified_gmt":"2022-07-25T16:23:00","slug":"il-y-a-279-ans-le-thermometre-au-mercure-etait-invente-a-lyon","status":"publish","type":"post","link":"https:\/\/lyonbondyblog.fr\/LBB\/il-y-a-279-ans-le-thermometre-au-mercure-etait-invente-a-lyon\/","title":{"rendered":"Il y a 279 ans, le thermom\u00e8tre au mercure \u00e9tait invent\u00e9 \u00e0 Lyon"},"content":{"rendered":"\n<p><strong>En cette p\u00e9riode de canicule,\u00a0de nombreuses personnes s\u2019informent sur les temp\u00e9ratures pour savoir comment s\u2019habiller ou pr\u00e9voir des activit\u00e9s.\u00a0Des donn\u00e9es rendu possible gr\u00e2ce \u00e0 l\u2019invention du thermom\u00e8tre au mercure :\u00a0une\u00a0invention purement Lyonnaise.<\/strong><\/p>\n\n\n\n<p>Dans l\u2019imaginaire collectif, nombreux sont les scientifiques \u00e0 revendiquer la cr\u00e9ation du thermom\u00e8tre.\u00a0De son invention par l\u2019italien\u00a0<strong><a href=\"https:\/\/www.universalis.fr\/encyclopedie\/santorio-santorio\/\" target=\"_blank\" rel=\"noreferrer noopener\">Santorio Santorio<\/a><\/strong>, en passant par <strong><a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-galilee-220\/\" target=\"_blank\" rel=\"noreferrer noopener\">Galil\u00e9e<\/a><\/strong> avec son thermom\u00e8tre \u00e0 eau rudimentaire ou encore les scientifiques\u00a0Allemand\u00a0<strong><a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/physique-daniel-gabriel-fahrenheit-1036\/\" target=\"_blank\" rel=\"noreferrer noopener\">Fahrenheit<\/a><\/strong> et Su\u00e9dois <strong><a href=\"https:\/\/www.universalis.fr\/encyclopedie\/anders-celsius\/\" target=\"_blank\" rel=\"noreferrer noopener\">Celsius<\/a><\/strong>, chacun y va de sa main.\u00a0Ces derniers \u00e9tant souvent consid\u00e9r\u00e9s comme les p\u00e8res fondateurs du<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/chimie-thermometre-mercure-11154\/?fbclid=IwAR0GA8KqBf9qd3Ez3swVnDFiXQ5X6owxqn63EBK0DXISDN9AT0L-J5bxMvA\" target=\"_blank\" rel=\"noreferrer noopener\"> <strong>thermom\u00e8tre au mercure<\/strong><\/a>, l\u2019histoire se trompe.\u00a0Cette invention serait \u00e0 l\u2019origine une invention fran\u00e7aise et qui plus est\u00a0lyonnaise.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Un projet de longue haleine qui s\u2019inscrit dans le temps<\/strong><\/h2>\n\n\n\n<p>Un projet comme celui-ci demande du temps.\u00a0La premi\u00e8re esquisse d\u00e9marre en 1740, date \u00e0 laquelle l\u2019ouvrage du math\u00e9maticien lyonnais <strong><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Jean-Pierre_Christin\" target=\"_blank\" rel=\"noreferrer noopener\">Jean-Pierre\u00a0Christin<\/a><\/strong>\u00a0\u00ab <em>Sur les thermom\u00e8tres<\/em> \u00bb est publi\u00e9.\u00a0De cet ouvrage, l\u2019auteur y conclut ces mots :\u00a0\u00ab<em> Pour construire de bons thermom\u00e8tres, je n\u2019ose m\u2019en assurer qu\u2019apr\u00e8s des observations et des exp\u00e9riences qui me restent \u00e0 faire\u00a0[\u2026]\u00a0et le mercure y sera pr\u00e9f\u00e9rable \u00e0 l\u2019esprit-de-vin.\u00a0<\/em>\u00bb D\u00e8s lors, l\u2019id\u00e9e est n\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"868\" height=\"500\" src=\"https:\/\/lyonbondyblog.fr\/LBB\/wp-content\/uploads\/2022\/07\/title-1531752845-1.jpg\" alt=\"\" class=\"wp-image-30411\" srcset=\"https:\/\/lyonbondyblog.fr\/LBB\/wp-content\/uploads\/2022\/07\/title-1531752845-1.jpg 868w, https:\/\/lyonbondyblog.fr\/LBB\/wp-content\/uploads\/2022\/07\/title-1531752845-1-768x442.jpg 768w\" sizes=\"auto, (max-width: 868px) 100vw, 868px\" \/><figcaption>Le 14 septembre 1740 \u00e0 Lyon, Jean-Pierre Christin \u00e9crit de sa main ses premi\u00e8res id\u00e9es sur les thermom\u00e8tres (Cr\u00e9dit\u00a0:<a href=\"https:\/\/www.sciencemuseum.org.uk\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u00a0L\u2019acad\u00e9mie des Sciences, Belles lettres et Arts<\/a>)<\/figcaption><\/figure><\/div>\n\n\n\n<p>Des lignes qui n\u2019ont l\u2019air de rien et pourtant, elles sont les pr\u00e9misses d\u2019une incroyable invention puisque trois ans plus tard, sera mise au point le premier thermom\u00e8tre au mercure nomm\u00e9 thermom\u00e8tre de Lyon.\u00a0Ce premier prototype aura pour particularit\u00e9 de proposer l\u2019\u00e9chelle centigrade de fa\u00e7on croissante\u00a0(de<strong> 0\u00b0<\/strong>, qui est la temp\u00e9rature de la glace au d\u00e9but de la d\u00e9cong\u00e9lation, \u00e0 <strong>100\u00b0 <\/strong>pour l\u2019eau en \u00e9bullition)\u00a0\u00e0 la diff\u00e9rence du Su\u00e9dois Anders Celsius qui avait choisi une m\u00e9thode d\u00e9croissante.<\/p>\n\n\n\n<p>Cette innovation r\u00e9volutionnaire est le fruit d\u2019un travail commun.\u00a0En s\u2019appuyant sur ses propres travaux, Jean-Pierre\u00a0Christin\u00a0aid\u00e9 par le verrier <strong>Pierre\u00a0Casati\u00a0<\/strong>ainsi que le physicien <strong>Henri\u00a0Burdin<\/strong>\u00a0ont pu cr\u00e9er le thermom\u00e8tre qui r\u00e9volutionn\u00e2t les sciences.\u00a0Bon nombre de thermom\u00e8tres avaient \u00e9t\u00e9 cr\u00e9\u00e9 les d\u00e9cennies pr\u00e9c\u00e9dentes notamment le c\u00e9l\u00e8bre <strong>thermom\u00e8tre de\u00a0R\u00e9aumur<\/strong>.\u00a0\u00c0 la diff\u00e9rence de ces derniers, ceux d\u2019avant 1743 n\u2019utilisaient pas la m\u00eame graduation ou pas le m\u00eame fluide\u00a0(eau, alcool, huile essentielle\u2026).\u00a0De ce fait et face \u00e0 ces r\u00e9sultats souvent moins pr\u00e9cis,\u00a0Jean-Pierre Christin, bien aid\u00e9 par les travaux de l\u2019allemand Gabriel Fahrenheit, entreprend l\u2019id\u00e9e que c\u2019est du m\u00e9tal liquide qu\u2019il faudra pour son outil.\u00a0C\u2019est dans une mine espagnole que le scientifique trouve un m\u00e9tal ayant les propri\u00e9t\u00e9s de dilatation n\u00e9cessaire, \u00e0 la r\u00e9alisation de son projet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Des recherches certifi\u00e9 100 % lyonnaises\u00a0<\/strong><\/h2>\n\n\n\n<p>Lors du d\u00e9but des recherches, Jean-Pierre\u00a0Christin, alors secr\u00e9taire perp\u00e9tuel de l\u2019Acad\u00e9mie des\u00a0Beaux-Arts\u00a0de Lyon, animait des groupes de paroles dans les locaux de l\u2019institution (situ\u00e9e place des cordeliers \u00e0 l\u2019actuel couloir de bus devant l\u2019\u00e9glise\u00a0Saint-Bonaventure).\u00a0Ancien \u00e9l\u00e8ve J\u00e9suite,\u00a0il\u00a0avait choisi ce lieu pour sa proximit\u00e9 avec l\u2019observatoire scientifique du grand coll\u00e8ge de la trinit\u00e9\u00a0(aujourd\u2019hui coll\u00e8ge et lyc\u00e9e Amp\u00e8re de Lyon).\u00a0 \u00c0 sa mort en 1755, il fut enterr\u00e9 dans une \u00e9glise du quartier des Terreaux, aujourd\u2019hui totalement disparu.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Un commerce et une utilisation florissante pour l\u2019\u00e9poque<\/strong><\/h2>\n\n\n\n<p>Gr\u00e2ce \u00e0 la fiabilit\u00e9 de leur invention,\u00a0Jean-Pierre\u00a0Christin\u00a0et\u00a0Pierre Casati\u00a0ont rapidement voulu en faire commerce.\u00a0C\u2019est dans la boutique de ce dernier, situ\u00e9 dans le bourg de la\u00a0Guilloti\u00e8re\u00a0que les tous premiers thermom\u00e8tres ont \u00e9t\u00e9 vendu aux populations de l\u2019\u00e9poque.\u00a0L\u2019enseigne, qui se situait \u00e0 l\u2019emplacement m\u00eame de l\u2019actuelle place du Pont, conna\u00eet un succ\u00e8s imm\u00e9diat. \u00c0 tel point que selon des estimations ce n\u2019est pas moins de <strong>700 thermom\u00e8tres lyonnais<\/strong> qui ont \u00e9t\u00e9 vendu \u00e0 Paris \u00e0 cette \u00e9poque, tout autant qu\u2019en Provence et dans le Dauphin\u00e9.<\/p>\n\n\n\n<p>Concernant son utilisation, l\u2019usage est multiple.\u00a0Les premiers \u00e0 l\u2019utiliser sont\u00a0les\u00a0soyeux de la ville pour am\u00e9liorer la production des vers de soie.\u00a0S\u2019en suivront, les m\u00e9decins pour d\u00e9terminer au mieux la fi\u00e8vre de leurs malades ainsi que les m\u00e9t\u00e9orologues pour\u00a0effectuer des calculs comparatifs.\u00a0C\u2019est gr\u00e2ce \u00e0 cet outil que l\u2019ann\u00e9e suivante, <strong>l\u2019Almanach de Lyon<\/strong> publie ces toutes premi\u00e8res mesures m\u00e9t\u00e9orologiques ;\u00a0un outil qui sera d\u00e8s lors et jusqu\u2019\u00e0 l\u2019apparition du digital, toujours utilis\u00e9s par les scientifiques.\u00a0\u00c9tablie sous la direction des j\u00e9suites du grand coll\u00e8ge de la trinit\u00e9 leur r\u00e9putation devient rapidement nationale.<\/p>\n\n\n\n<p>Cette\u00a0innovation\u00a0a \u00e9galement permis les collectes et mesures des temp\u00e9ratures.\u00a0Les saisons \u00e9tant moins changeantes \u00e0 l\u2019\u00e9poque, le thermom\u00e8tre a pu enregistrer jusqu\u2019\u00e0 <strong>-18 degr\u00e9s <\/strong>en janvier 1749 \u00e0 Lyon.\u00a0Des temp\u00e9ratures glaciales qui ne feront pas moins d\u2019une centaine de morts dans les rues de la ville.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Un objet devenu rare et pr\u00e9cieux avec le temps<\/strong><\/h2>\n\n\n\n<p>Si aujourd\u2019hui, l\u2019utilisation des thermom\u00e8tres au mercure est devenue archa\u00efque voir m\u00eame dangereuse pour la sant\u00e9.\u00a0<a href=\"https:\/\/academie-sbla-lyon.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">L\u2019acad\u00e9mie des Sciences, Belles lettres et Arts<\/a> n\u2019en poss\u00e8de aucun.\u00a0Le seul exemplaire encore visible au grand public se trouve au mus\u00e9e des sciences de Londres.\u00a0Il a pu \u00eatre conserv\u00e9 gr\u00e2ce \u00e0 des marchands italiens qui commer\u00e7aient en Angleterre.\u00a0Dat\u00e9 de 1750, il mesure 30 centim\u00e8tres de long.<\/p>\n\n\n\n<p>Aujourd\u2019hui et face\u00a0au digital\u00a0qui a pris le pas sur le mercure, il ne faut pas oublier Jean-Pierre\u00a0Christin\u00a0et Pierre\u00a0Castin\u00a0pour autant.\u00a0Gr\u00e2ce \u00e0 eux, le froid et le chaud sont devenus des valeurs mesurables et non plus des impressions impr\u00e9cises de la part des populations.\u00a0<\/p>\n\n\n\n<p class=\"has-text-align-right\"><strong>Thibaut Eperdussin<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-left\"><strong>Retrouvez nos derniers articles ici : <\/strong><\/p>\n\n\n<ul class=\"wp-block-latest-posts__list wp-block-latest-posts\"><li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/lyonbondyblog.fr\/LBB\/hand-feminin-direction-les-playoffs-pour-les-lionnes\/\">Hand F\u00e9minin : Direction les playoffs pour les lionnes<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/lyonbondyblog.fr\/LBB\/villeurbanne-le-printemps-citoyen-souhaite-se-rapprocher-des-habitants\/\">Villeurbanne : le Printemps citoyen souhaite se rapprocher des habitants<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/lyonbondyblog.fr\/LBB\/for-sure\/\">For Sure<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/lyonbondyblog.fr\/LBB\/cinema-soumsoum-la-nuit-des-astres-un-voyage-aux-frontieres-du-visible-et-de-linvisible\/\">Cin\u00e9ma: \u00ab\u00a0Soumsoum, la nuit des astres\u00a0\u00bb un voyage aux fronti\u00e8res du visible et de l\u2019invisible<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/lyonbondyblog.fr\/LBB\/etats-unis-donald-trump-le-syndrome-napoleon\/\">\u00c9tats-Unis : Donald Trump, le syndr\u00f4me Napol\u00e9on?<\/a><\/li>\n<\/ul><!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>En cette p\u00e9riode de canicule,\u00a0de nombreuses personnes s\u2019informent sur les temp\u00e9ratures pour savoir comment s\u2019habiller ou pr\u00e9voir des activit\u00e9s.\u00a0Des donn\u00e9es rendu possible gr\u00e2ce \u00e0 l\u2019invention &hellip; <!-- AddThis Advanced Settings generic via filter on wp_trim_excerpt --><!-- AddThis Share Buttons generic via filter on wp_trim_excerpt --><\/p>\n","protected":false},"author":1,"featured_media":30413,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_FSMCFIC_featured_image_caption":"","_FSMCFIC_featured_image_nocaption":"","_FSMCFIC_featured_image_hide":"","footnotes":""},"categories":[3,4],"tags":[28152,28151,28153,241,28150,28154,10,28149,28148],"class_list":["post-30402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-culture","category-lyon","tag-celsius","tag-fahrenheit","tag-galilee","tag-histoire","tag-invention","tag-jean-pierre-christin","tag-lyon-2","tag-science","tag-thermometre-au-mercure"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Il y a 279 ans, le thermom\u00e8tre au mercure \u00e9tait invent\u00e9 \u00e0 Lyon - Lyon Bondy Blog<\/title>\n<meta name=\"description\" content=\"Des donn\u00e9es rendu possible gr\u00e2ce 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