A collection of 13 Geissler and Crookes tubes
Crookes tube containing phosphorescent mineral, 6¾in. (17cm.) long; Geissler tube with internal spiral pattern, 8½in. (21cm.); spiral pattern with part green uranium[?] glass, 9in. (23cm.); internal floral pattern of green uranium[?] glass, 6¼in. (16cm.); with 9 others (13)
A collection of 13 Geissler and Crookes tubes
Crookes tube containing phosphorescent mineral, 6¾in. (17cm.) long; Geissler tube with internal spiral pattern, 8½in. (21cm.); spiral pattern with part green uranium[?] glass, 9in. (23cm.); internal floral pattern of green uranium[?] glass, 6¼in. (16cm.); with 9 others (13)
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