{"id":621717,"date":"2026-01-18T21:01:47","date_gmt":"2026-01-18T20:01:47","guid":{"rendered":"https:\/\/cronologia-universale.it\/1897-7\/"},"modified":"2026-01-18T21:01:47","modified_gmt":"2026-01-18T20:01:47","slug":"1880-3","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/1880-3\/","title":{"rendered":"1880"},"content":{"rendered":"<p>United States. Thomas Alva Edison discovers the emission of radiation by metals heated to high temperatures. He calls it the thermionic effect and patents it (without having any idea what use it would actually be made of). In fact, the same effect had already been reported by Englishman Frederick Guthrie in 1873.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>United States. Thomas Alva Edison discovers the emission of radiation by metals heated to high&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41],"tags":[],"class_list":["post-621717","post","type-post","status-publish","format-standard","hentry","category-s-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>1880 - Cronologia Universale<\/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:\/\/cronologia-universale.it\/en\/1880-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1880 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"United States. 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