S07-032. Probably American, 1st quarter 20th century, unsigned. Two thin sections of transparent green tourmaline mounted in independently rotatable disks at the ends of a pair of spring tongs. The tourmaline sections act as polarizer and analyzer so that, with their axes set at right angles to each other, the interference figure of a crystal specimen placed between them can be seen. These attractive sets of tourmaine tongs are all in very good overall condition.
Price...................................................$225 each
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