{"id":621655,"date":"2026-01-18T20:59:42","date_gmt":"2026-01-18T19:59:42","guid":{"rendered":"https:\/\/cronologia-universale.it\/1894-2\/"},"modified":"2026-01-18T20:59:42","modified_gmt":"2026-01-18T19:59:42","slug":"april-18-1878","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/april-18-1878\/","title":{"rendered":"April 18, 1878"},"content":{"rendered":"<p>Thomas Alva Edison rose from celebrity to eminence, accepting an invitation to present his talking phonograph to the National Academy of Sciences at the Smithsonian Institution in Washington. George Barker of the University of Pennsylvania organized a public comparison of telephones made by Bell, Phelps, Gray, and Edison. The first three, all magnetic, suffered from weak signals and co-interference on the Philadelphia line, while Edison&#8217;s, thanks to its carbon transmitter, sounded loud and clear.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thomas Alva Edison rose from celebrity to eminence, accepting an invitation to present his talking&#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":[36],"tags":[],"class_list":["post-621655","post","type-post","status-publish","format-standard","hentry","category-fc-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>April 18, 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\/april-18-1878\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"April 18, 1878 - 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