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Geissler
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A 30 cm double chamber Geissler tube ca 1930
Four branch Geissler tube
A small 30 cm model with four different colored liquids.
Activated tube
A rare old waffle or grid tube
This small 15cm high tube from the beginning of the 20th century has a partly uranium glass waffle and filled with a liquid.
Tube under UV light.
The liquid becomes misty.
Picture from the 1924
Becker & Co catalogue.
Product of Pressler.
Activated tube
20cm Geissler tube with twists filled with orange liquid
Large 30 cm Geissler tube ca 1900.
The tube can be filled with colored liquid, in this case Fluorescein.
Geissler tube length 27cm filled with Rhodamine pink-red.
ca 1930
Geissler tube length 27cm filled with Rhodamine orange.
ca 1930
20cm Geissler tube with unknown liquid
15cm Geissler tube with magdala red liquid
20cm double trumpet tube with fluorescein liquid.
A small 10cm Geissler tube with transparent fluorescent liquid in a second glass jacket.
Tube filled with quinine solution for a bright Blue colour.
Close-up of the interior of a Geissler tube filled with a fluorescent liquid under influence of UV light.
15cm orange liquid Geissler tube

A 35cm double chamber tube
ca 1920
A restored 40cm tube