Joined: Wed Jan 23, 2013 5:29 pm Posts: 1047 Location: Paris
I don't really know where to post this question. I have just read an old jewellery technique book, dating back from 1930 - 1940. One chapter about gemological tools mentions a polariscope (it was not named so at that time) made of two tourmaline slices in crossed positions instead of our modern polarized filters. Has anybody heard of this old device ? Would that work fine ?
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