An unusual double Crooke's tube, the two pear-shaped bulbs each containing a fluorescing mineral sample, joined by a cross-tube, on a turned wooden base -- 37.5cm. (14¾in.) high
An unusual double Crooke's tube, the two pear-shaped bulbs each containing a fluorescing mineral sample, joined by a cross-tube, on a turned wooden base -- 37.5cm. (14¾in.) high
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