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History and Physics Instruments
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liquid filled models
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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.
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.
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.
Geissler tube length 27cm filled with Rhodamine orange.
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
A restored 40cm tube filled with fluorescein producting the bright yellow colour.
This is a very old 54 cm Geissler tube filled with aesculin fluid which fluorescences bright blue.
ca: last quarter 19th century
Nice work of the glassblower, a knot in the inner tube.
Nice 26cm Biloret&Mora Geissler tube.
Another 28cm Biloret&Mora Geissler tube
Biloret&Mora was a French company with shops in London and Paris. The are known for the their high quality tubes with destinctive caps.