This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionX-ray tube 3.jpg
English: An early Crookes x-ray tube from museum of Wilhelm Conrad Röntgen in Würzburg. These first generation 'cold cathode' tubes were used from the 1890s until about 1920. The electrode at the left is the cathode, which releases a stream of electrons which strike the angled anode at the center of the bulb, generating x-rays, which radiate through the rear wall of the glass envelope. The anode is a massive bar to dissipate the heat generated by the electron beam. The sausage-shaped glass bulb attached at the bottom is a 'softener' device, which controls the residual pressure in the tube. Crookes tubes required some gas in them to operate. However, over time the gas was absorbed by the walls of the tube, lowering the pressure, resulting in 'harder' x-rays, until the tube stopped working entirely. The 'softener' used various methods to release a small amount of gas into the tube, restoring it to operation.
I, the copyright holder of this work, hereby publish it under the following licenses:
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
{{Information |Description=Old X-ray tube from museum of Wilhelm Conrad Röntgen in Würzburg |Source=my own camera |Date=May 8th 2008 (see EXIF) |Author=me |Permission=Own work |other_versions= }} {{self|GFDL|cc-by-sa-3.0,2.5,2.0,1.0}} [[Category:X-ray