{"id":2260,"date":"2011-05-24T18:14:53","date_gmt":"2011-05-24T18:14:53","guid":{"rendered":"http:\/\/www.andrewgrantham.co.uk\/soundmirrors\/?p=2260"},"modified":"2011-05-24T18:14:53","modified_gmt":"2011-05-24T18:14:53","slug":"forgotten-technologies-giant-ears-of-concrete","status":"publish","type":"post","link":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/forgotten-technologies-giant-ears-of-concrete\/","title":{"rendered":"Forgotten technologies: Giant ears of concrete"},"content":{"rendered":"<p>&#8220;<a href=\"http:\/\/einestages.spiegel.de\/static\/topicalbumbackground\/22748\/riesenohren_aus_beton.html\">Vergessene Technologien &#8211; Riesenohren aus Beton<\/a>&#8221; (Forgotten technologies &#8211; Giant ears of concrete) is a 23 May 2011 German-language article by Solveig Grothe on the website of <cite>Spiegel<\/cite>. It has a history of sound mirror development between the wars, and features some <a href=\"http:\/\/einestages.spiegel.de\/static\/topicalbumgallery\/22748\/riesenohren_aus_beton.html\">photos of sound mirrors<\/a> from the <a href=\"http:\/\/www.flickr.com\/groups\/soundmirrors\/\">Sound Mirrors Flickr group<\/a> (used with the permission of the photographers).<\/p>\n<blockquote><p><q>With reinforced concrete shells the size of a house, the British listened in the 20s and 30s for enemy aircraft.  The acoustic experiments along the coast gave the island extraordinary architectural monuments &#8211; and an interception technique to which was used to the outbreak of World War II.<\/q><\/p><\/blockquote>\n<p>Und jetzt, die artikel auf Englisch: <a href=\"http:\/\/www.spiegel.de\/international\/zeitgeist\/0,1518,765771,00.html\">Listening for the Enemy, Giant Ears on the British Coast<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;Vergessene Technologien &#8211; Riesenohren aus Beton&#8221; (Forgotten technologies &#8211; Giant ears of concrete) is a 23 May 2011 German-language article by Solveig Grothe on the website of Spiegel. It has a history of sound mirror development between the wars, and features some photos of sound mirrors from the Sound Mirrors Flickr group (used with the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5,7,9],"tags":[62],"class_list":["post-2260","post","type-post","status-publish","format-standard","hentry","category-books-and-references","category-history","category-links","category-sound-mirrors","tag-spiegel"],"_links":{"self":[{"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/posts\/2260","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/comments?post=2260"}],"version-history":[{"count":0,"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/posts\/2260\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/media?parent=2260"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/categories?post=2260"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.andrewgrantham.co.uk\/soundmirrors\/wp-json\/wp\/v2\/tags?post=2260"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}