{"id":621657,"date":"2026-01-18T20:59:45","date_gmt":"2026-01-18T19:59:45","guid":{"rendered":"https:\/\/cronologia-universale.it\/1894-4\/"},"modified":"2026-01-18T20:59:45","modified_gmt":"2026-01-18T19:59:45","slug":"may-13-1878","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/may-13-1878\/","title":{"rendered":"May 13, 1878"},"content":{"rendered":"<p>Engineer Joseph Henry dies in his sleep. He was the first to explain the design principles of electromagnets, and built an enormous one capable of lifting 660 pounds. He never patented his inventions. The unit of measurement for magnetic induction is named after him.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Engineer Joseph Henry dies in his sleep. He was the first to explain the design&#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":[40],"tags":[],"class_list":["post-621657","post","type-post","status-publish","format-standard","hentry","category-mt-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>May 13, 1878 - 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\/may-13-1878\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"May 13, 1878 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"Engineer Joseph Henry dies in his sleep. 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