{"id":372,"date":"2019-05-26T11:50:51","date_gmt":"2019-05-26T11:50:51","guid":{"rendered":"http:\/\/mher.khalatyan.com\/?p=372"},"modified":"2019-05-26T16:25:15","modified_gmt":"2019-05-26T16:25:15","slug":"photocopiers","status":"publish","type":"post","link":"https:\/\/mher.khalatyan.com\/?p=372","title":{"rendered":"Photocopiers"},"content":{"rendered":"

 <\/p>\n

Few inventions have transformed office life as much as \u2018Xerography\u2019. Before photocopiers came on the market, if you wanted a copy of a document you had three alternates: copy it out on a typewriter or by hand, have it photographed, or take it to a printer. The first was long-winded, the second and third costly and the third also useless if you only wanted a single copy.<\/span><\/p>\n

American physicist Chester Carlson worked on the answer to this problem in the 1930s. He devised a process in which an electrostatic charge is induces on a surface, which varies the charge is induced on a surface. Light from the original is reflected on to the surface, which varies the charge. When the \u2018toner\u2019, a coloured dust, is charged and blown over the surface, it is attracted to the pattern of the image but rejected by the background, resulting in a copy.<\/span><\/p>\n

Carlson filed a patent for a copying machine in 1939. But it was over ten years before the copier was marketed. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

  Few inventions have transformed office life as much as \u2018Xerography\u2019. Before photocopiers came on the market, if you wanted a copy of a document you had three alternates: copy it out on a...<\/p>\n","protected":false},"author":1,"featured_media":374,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-372","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-inventions"],"_links":{"self":[{"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/posts\/372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=372"}],"version-history":[{"count":1,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/posts\/372\/revisions"}],"predecessor-version":[{"id":373,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/posts\/372\/revisions\/373"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=\/wp\/v2\/media\/374"}],"wp:attachment":[{"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mher.khalatyan.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}