{"id":10153,"date":"2024-12-15T06:21:35","date_gmt":"2024-12-15T06:21:35","guid":{"rendered":"https:\/\/museumkesher.org.il\/catalog\/polarised-british-telegraph-sounder\/"},"modified":"2024-12-15T12:45:05","modified_gmt":"2024-12-15T12:45:05","slug":"polarised-british-telegraph-sounder","status":"publish","type":"catalog","link":"https:\/\/museumkesher.org.il\/en\/catalog\/polarised-british-telegraph-sounder\/","title":{"rendered":"Polarised British Telegraph Sounder"},"content":{"rendered":"<p>British polarised telegraph sounder, receiving morse code transmission by listening to the sounder\u2019s \u2018clicks\u2019.<br \/>\nThe armature moves between two stops; a permanent magnet pulls the armature and an adjustable spring applies offsetting force; the armature stays in place until opposing current moves it to the other stop.<br \/>\nThe current in coil D sets the armature to the downward stop; the current in coil U sets the armature to the upward stop; polarised current when the two coils are in series moves the armature up and down.<br \/>\nThe technological advantage of the polarised technology is high sensitivity, requiring low current to move the armature.<br \/>\nUsed by the British Post Office and the British Military since 1911.<br \/>\nUsed during the British Mandate.<\/p>\n","protected":false},"featured_media":10116,"template":"","catalog_cat":[30],"period":[99],"class_list":["post-10153","catalog","type-catalog","status-publish","has-post-thumbnail","hentry","catalog_cat-telegraphy","period-pre-state"],"acf":[],"_links":{"self":[{"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/catalog\/10153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/catalog"}],"about":[{"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/types\/catalog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/media\/10116"}],"wp:attachment":[{"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/media?parent=10153"}],"wp:term":[{"taxonomy":"catalog_cat","embeddable":true,"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/catalog_cat?post=10153"},{"taxonomy":"period","embeddable":true,"href":"https:\/\/museumkesher.org.il\/en\/wp-json\/wp\/v2\/period?post=10153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}