{"id":19744,"date":"2025-03-17T10:54:45","date_gmt":"2025-03-17T11:54:45","guid":{"rendered":"https:\/\/museu-angra.cultura.azores.gov.pt\/others\/historical-pieces\/octant-frame\/"},"modified":"2025-12-31T09:42:31","modified_gmt":"2025-12-31T10:42:31","slug":"octant-frame","status":"publish","type":"page","link":"https:\/\/museu-angra.cultura.azores.gov.pt\/en\/others\/historical-pieces\/octant-frame\/","title":{"rendered":"Octant Frame"},"content":{"rendered":"\n<div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile is-vertically-aligned-top\" style=\"grid-template-columns:auto 40%\"><div class=\"wp-block-media-text__content\">\n<p><p data-start=\"111\" data-end=\"458\">The octant is a double-reflection navigation instrument invented by Thomas Godfrey and John Hadley in the early 1730s. This device allowed readings of altitudes up to 90\u00b0, a capability that made it a highly useful tool for astronomical navigation at sea. Its compact design and the use of mirrors increased the accuracy of latitude measurements.<\/p>&#13;\n<p data-start=\"460\" data-end=\"956\">The inscription on this base, <em data-start=\"490\" data-end=\"545\">\u201cCrichton Bros. London, Made for J. Warden Liverpool\u201d<\/em>, helps reconstruct part of its history. The Crichton Brothers worked between 1871 and 1877 at 11 Biliter Street, London, as manufacturers of mathematical, optical, and nautical instruments, supplying other vendors of such products, such as John Warden, established at 2 Canning Place, Liverpool, between 1864 and 1874, who, although also producing precision instruments, did not manufacture nautical devices.<\/p>&#13;\n<p data-start=\"111\" data-end=\"458\">The octant is a double-reflection navigation instrument invented by Thomas Godfrey and John Hadley in the early 1730s. This device allowed readings of altitudes up to 90\u00b0, a capability that made it a highly useful tool for astronomical navigation at sea. Its compact design and the use of mirrors increased the accuracy of latitude measurements.<\/p>&#13;\n<p data-start=\"460\" data-end=\"956\">The inscription on this base, <em data-start=\"490\" data-end=\"545\">\u201cCrichton Bros. London, Made for J. Warden Liverpool\u201d<\/em>, helps reconstruct part of its history. The Crichton Brothers worked between 1871 and 1877 at 11 Biliter Street, London, as manufacturers of mathematical, optical, and nautical instruments, supplying other vendors of such products, such as John Warden, established at 2 Canning Place, Liverpool, between 1864 and 1874, who, although also producing precision instruments, did not manufacture nautical devices.<\/p>&#13;\n<p data-start=\"958\" data-end=\"1105\">This object was incorporated into the <strong data-start=\"996\" data-end=\"1022\">Archaeology Collection<\/strong> of the Museum of Angra do Heroismo, following a chance discovery in Fanal Bay.<\/p>&#13;\n<p data-start=\"1107\" data-end=\"1169\">_<br data-start=\"1108\" data-end=\"1111\"\/>In the catalogue <em data-start=\"1128\" data-end=\"1150\">Stories from the Sea<\/em> | 2013 [adapted]<\/p><\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"630\" height=\"400\" src=\"https:\/\/museu-angra.cultura.azores.gov.pt\/wp-content\/uploads\/2025\/03\/banner-87.jpg\" alt=\"\" class=\"wp-image-12698 size-full\" srcset=\"https:\/\/museu-angra.cultura.azores.gov.pt\/wp-content\/uploads\/2025\/03\/banner-87.jpg 630w, https:\/\/museu-angra.cultura.azores.gov.pt\/wp-content\/uploads\/2025\/03\/banner-87-300x190.jpg 300w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The octant is a double-reflection navigation instrument invented by Thomas Godfrey and John Hadley in the early 1730s. This device allowed readings of altitudes up to 90\u00b0, a capability that made it a highly useful tool for astronomical navigation at sea. Its compact design and the use of mirrors increased the accuracy of latitude measurements. [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":19114,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-19744","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Octant Frame - Museum of Angra do Heroismo<\/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:\/\/museu-angra.cultura.azores.gov.pt\/en\/others\/historical-pieces\/octant-frame\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Octant Frame - Museum of Angra do Heroismo\" \/>\n<meta property=\"og:description\" content=\"The octant is a double-reflection navigation instrument invented by Thomas Godfrey and John Hadley in the early 1730s. 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