{"id":31,"date":"2024-04-04T04:31:17","date_gmt":"2024-04-04T01:31:17","guid":{"rendered":"https:\/\/sisu.ut.ee\/heritage-analysis\/case-study-1\/"},"modified":"2024-07-19T22:04:58","modified_gmt":"2024-07-19T19:04:58","slug":"case-study-1","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/heritage-analysis\/case-study-1\/","title":{"rendered":"7.1. Case study 1"},"content":{"rendered":"<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\"><span style=\"color: #b22222;\">pXRF analysis of telescope mirror from the University of Tartu Museum<\/span><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-8cf370e7 wp-block-group-is-layout-flex\">\n<p>This investigation was performed by the Janet Laidla, Kadri Tinn and Ragnar Saage from the University of Tartu Museum and Institute of history and archaeology.<\/p>\n\n\n\n<p>The purpose of this research was to try and determine the suitability\u00a0of a portative X-ray fluorescence spectrometer (pXRF) for ascertaining\u00a0the chemical composition of telescope mirror in a non-invasive\u00a0way. The mirror probably date back to the\u00a0early 19th century and was made by William Herschel and Johann\u00a0Gottlieb Friedrich Schrader (although this is not 100% clear). One\u00a0aim was to see whether the chemical composition of the objects was\u00a0similar to what we know about the telescope mirrors of the time.\u00a0<\/p>\n\n\n\n<p>The results of the pXRF analysis show that the chemical composition of the mirror is similar\u00a0to contemporary recipes. By a recipes a mixture of copper and tin was used to make speculum metal with the addition of a variety of metals and other compounds to add strength and lustre to the telescope mirror. Analysed mirror show less copper\u00a0and more tin than the recipes would allow. It cannot be conclusively determined whether this is due to the restrictions of xPRF measuring (only from the surface of the mirror) or less copper was included while making smaller mirrors in the early 19th century. [Tartu \u00dclikooli ajaloo k\u00fcsimusi XLV (2017)]<\/p>\n<\/div>\n\n\n\n<p><\/p><div class=\"ratio ratio-16x9 mb-3\"><div class=\"video-placeholder-wrapper video-placeholder-wrapper--16x9\">\n\t\t\t    <div class=\"video-placeholder d-flex justify-content-center align-items-center\">\n\t\t\t        <div class=\"overlay text-white p-2 w-100 text-center d-block justify-content-center align-items-center\">\n\t\t\t            <div>To view third-party content, please accept cookies.<\/div>\n\t\t\t            <button class=\"btn btn-secondary btn-sm mt-1 consent-change\">Change consent<\/button>\n\t\t\t        <\/div>\n\t\t\t    <\/div>\n\t\t\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>pXRF analysis of telescope mirror from the University of Tartu Museum This investigation was performed by the Janet Laidla, Kadri Tinn and Ragnar Saage from the University of Tartu Museum and Institute of history and archaeology. The purpose of this &#8230;<\/p>\n","protected":false},"author":151,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-31","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/pages\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/users\/151"}],"replies":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/comments?post=31"}],"version-history":[{"count":4,"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/pages\/31\/revisions"}],"predecessor-version":[{"id":1209,"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/pages\/31\/revisions\/1209"}],"wp:attachment":[{"href":"https:\/\/sisu.ut.ee\/heritage-analysis\/wp-json\/wp\/v2\/media?parent=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}