{"id":67,"date":"2024-11-08T20:09:23","date_gmt":"2024-11-08T20:09:23","guid":{"rendered":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/?page_id=67"},"modified":"2025-03-10T16:35:09","modified_gmt":"2025-03-10T16:35:09","slug":"general-electric-pr-1","status":"publish","type":"page","link":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/home\/controlling-light\/general-electric-pr-1\/","title":{"rendered":"General Electric PR-1 Exposure Meter c.1950s"},"content":{"rendered":"\n<p>Exposure meters such as the PR-1 relied on Selenium. This GE meter was known for its size and portability, the point and lock feature of the needle, and the new trident analyzer.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-large is-resized\"><a href=\"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-scaled.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"683\" height=\"1024\" src=\"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-683x1024.jpg\" alt=\"General Electric PR-1 Exposure Meter, 1950s. In box.\" class=\"wp-image-111\" style=\"aspect-ratio:0.6669921875;width:414px;height:auto\" srcset=\"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-683x1024.jpg 683w, https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-200x300.jpg 200w, https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-768x1152.jpg 768w, https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-1024x1536.jpg 1024w, https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-1365x2048.jpg 1365w, https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-580x870.jpg 580w, https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-content\/uploads\/sites\/8\/2024\/11\/GEPR1Meter-scaled.jpg 1707w\" sizes=\"(max-width: 683px) 100vw, 683px\" \/><\/a><\/figure><\/div>\n\n\n<p>A trident analyzer\u2014an indicator with three markers\u2014allowed the photographer to align the F-stop with either the accurate light reading, one F-stop higher, or one F-stop lower. Since light meters are not completely accurate, making additional exposures that are one stop up and one stop down from the given reading compensate for possible miscalculation by the meter. This process is called bracketing. &nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exposure meters such as the PR-1 relied on Selenium. This GE meter was known for its size and portability, the point and lock feature of the needle, and the new&hellip;<\/p>\n","protected":false},"author":4,"featured_media":112,"parent":65,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/pages\/67"}],"collection":[{"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/comments?post=67"}],"version-history":[{"count":3,"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/pages\/67\/revisions"}],"predecessor-version":[{"id":297,"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/pages\/67\/revisions\/297"}],"up":[{"embeddable":true,"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/pages\/65"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/media\/112"}],"wp:attachment":[{"href":"https:\/\/library.umbc.edu\/specialcollections\/cavanaugh\/wp-json\/wp\/v2\/media?parent=67"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}