The Cathode Ray Tube site
electronic glassware
History and Physics Instruments
electronic glassware
History and Physics Instruments
Geissler tubes
The first discharge light
The first discharge light
HOME
PREV
The second page
2 small 10cm early Geissler tubes with original box.
Sadly the vacuum is lost due to minor cracks between the sealing and the platinum connection wires. This is a common failure with this old tubes.
Sadly the vacuum is lost due to minor cracks between the sealing and the platinum connection wires. This is a common failure with this old tubes.
Fine early Geissler tube with uranium glass twist.
Details in the centre.
Small 11cm tube with turn.
Rare 15cm tube with interrupted wobble.
An early 18cm tube with interrupted uranium glass curl.
The electrodes are sealed with blue glass, late 1800.
Unless it's age the vacuum is still perfect!
The electrodes are sealed with blue glass, late 1800.
Unless it's age the vacuum is still perfect!
Didactic Geissler discharge tube.
This is a very early example from the late 1800's on a nice black painted wooden stand.
This is a very early example from the late 1800's on a nice black painted wooden stand.
Two double twist with Catherine wheel Geissler tubes.
The larger tube has the typical early wire connections in this case probably Dumet wire which came in use after 1911 and replaced the expensive Platinum wire.
Dumet wire consisted of a 42% nickel -iron alloy coated with a thin layer of copper and is a bit thicker than the old Platinum wire.
For more info about Dumet wire look here.
The larger tube has the typical early wire connections in this case probably Dumet wire which came in use after 1911 and replaced the expensive Platinum wire.
Dumet wire consisted of a 42% nickel -iron alloy coated with a thin layer of copper and is a bit thicker than the old Platinum wire.
For more info about Dumet wire look here.
Nice old 20 cm Geissler tube with two uranium glass grapes.
Early small 10cm tube with wire loops The light between the three uranium glass bubbles has a stratification effect.
Prev
page
page
See even more fine Geissler tubes on the next page!
Third
page
page
Third
page
page
