Geissler tube 70 cm long with six bulbs each with a punctured glass membrane, the four central bulbs being of uranium glass Geissler tube 70 cm long with six bulbs each with a punctured glass membrane
Geissler tube 69 cm long with two spirals each surrounded by a tube for fluorescent liquid and joined by a short uranium glass tube Geissler tube
Geissler tube, U-shaped with four bulbs and four spirals (two of the spirals in uranium glass), overall length 315 mm Geissler tube
