{"id":13789,"date":"2019-01-31T07:22:03","date_gmt":"2019-01-31T11:22:03","guid":{"rendered":"http:\/\/phsc.ca\/camera\/?p=13789"},"modified":"2019-01-30T23:21:56","modified_gmt":"2019-01-31T03:21:56","slug":"the-age-of-selenium-begins","status":"publish","type":"post","link":"https:\/\/phsc.ca\/camera\/the-age-of-selenium-begins\/","title":{"rendered":"the age of selenium begins"},"content":{"rendered":"
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Rhamstine Electrophot c1931<\/p><\/div>\n

Toronto<\/strong>. In February and September of 2017 I wrote a number of posts about photographic meters. One of our long time members was rummaging through his collection when he came across his M-OS Rhamstine Electrophot. This meter led him to a site called a virtual Lightmeter museum<\/a>. So far it only presents meters from 1931-1935.<\/p>\n

Of all the meters shown, only the Weston 650 was the subject of one of my posts. I found it interesting that the 1931 meters needed batteries to function. A year later an improved selenium cell was light sensitive enough to be used without a battery. Selenium cells stayed in use into the 1960s when cadmium sulfide<\/a> (CdS<\/a>) cells became common – requiring a tiny battery once again. Far more sensitive, the cells for the first time allowed low light measurements, including enlarging meters used in the darkroom as well as cameras.<\/p>\n

Another great site for meters is James Ollinger’s<\/a> site. Have a look at the two sites and take a walk back in history.<\/p>\n

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Toronto. In February and September of 2017 I wrote a number of posts about photographic meters. One of our long time members was rummaging through his collection when he came across his M-OS Rhamstine Electrophot. This meter led him to … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[964,200,2419,2418,854],"class_list":["post-13789","post","type-post","status-publish","format-standard","hentry","category-camera","tag-cds","tag-meter","tag-ollinger","tag-rhamstine","tag-selenium"],"_links":{"self":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/13789","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/comments?post=13789"}],"version-history":[{"count":2,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/13789\/revisions"}],"predecessor-version":[{"id":13793,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/posts\/13789\/revisions\/13793"}],"wp:attachment":[{"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/media?parent=13789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/categories?post=13789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phsc.ca\/camera\/wp-json\/wp\/v2\/tags?post=13789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}