chromatic-aberration Posted March 29, 2008 Share Posted March 29, 2008 I picked up a GM Model B Exposure meter at the flea market today, and I waswondering if anyone knew when these things were manufactured. Link to comment Share on other sites More sharing options...
chromatic-aberration Posted March 29, 2008 Author Share Posted March 29, 2008 ...and the reverse: Link to comment Share on other sites More sharing options...
alex_lofquist Posted March 30, 2008 Share Posted March 30, 2008 I have lived in the Chicago area for many years, and have never heard of G-M Laboratories. From its Art-Deco appearance I'd guess it to have been built in the late thirties. It may have been manufactured to compete with the Weston Master for which it has a slight resemblence. I think that it is pretty cute! Link to comment Share on other sites More sharing options...
chromatic-aberration Posted March 30, 2008 Author Share Posted March 30, 2008 The nice thing is that it still seems to be working perfectly. It isn't calibrated for ASA film speeds though, so that's a clue right there that it's probably not postwar. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted March 30, 2008 Share Posted March 30, 2008 Pre war there were many film speeds; all abit different. GE speed; Weston speed; Kodak speed etc. ASA speed came out during ww2; a miltary way of standardizing the mess. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted March 30, 2008 Share Posted March 30, 2008 G-M Laboratories made pinball machines in Chicago in the 1930's; in a city that back then was a powerhouse of radio and photo makers too. G-M Laboratories was on Belmont avenue. GN made precision galvonometers for lab work; they made photolectric cells; they made relays; they made those giant suspended galvonometers we used in EE labs for bridge ciruit experiments; they also made lab stuff for botany testing; PH testing etc. Link to comment Share on other sites More sharing options...
alex_lofquist Posted March 31, 2008 Share Posted March 31, 2008 That's interesting info. Are they still in business? Or were they were taken over by General Radio or Leeds & Northrup? Link to comment Share on other sites More sharing options...
marc_bergman1 Posted April 3, 2008 Share Posted April 3, 2008 Christopher, <p> I found an ad in the February 1942 issue showing this meter. <p> I found another ad in the November 1940 issue. It is a full page ad announcing this meter for $8.75. It is on page 11. The face of the meter looks slightly different but it is a Model B. <p> The GE-48 listed for $21. The Weston Master 715 listed for $24. These are 1940 prices. <p><div></div> Link to comment Share on other sites More sharing options...
marc_bergman1 Posted April 3, 2008 Share Posted April 3, 2008 This picture is from the February 1942 issue. Link to comment Share on other sites More sharing options...
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