Image:Crookes tube.jpg

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[edit] Summary

Description

An early Crookes x-ray tube on display in the lobby of the Science Building at Winthrop University. These first generation 'cold cathode' tubes were used until about 1920. The electrode on the right is the cathode or negative electrode. The slanted electrode in the center of the bulb is the platinum anode or target. The electrode to the left is the auxiliary anode. The two projections on the neck of the tube to the right is a 'softening device' to control the pressure in the tube. With time the residual gas in Crookes tubes was adsorbed by the walls, increasing the vacuum. This reduced the amount of x-rays produced and resulted in 'harder' more energetic x-rays, until finally the tube stopped working. The 'softeners' used various techniques to release a small amount of gas into the tube, restoring it's function.
Source

Photo by Y. Trottier
Date

April 10th, 2006
Author

Y. Trottier
Permission
(Reusing this image)

See below


[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head 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".

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Date/TimeDimensionsUserComment
current03:52, 10 April 20062,288×1,712 (494 KB)Ytrottier (An "electron tube" on display in the lobby of the Science Building at Winthrop University. Photo by Y. Trottier, April 10th, 2006.)
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Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.

Camera manufacturer OLYMPUS CORPORATION
Camera model C770UZ
Exposure time 1/2 sec (0.5)
F-number f/3.2
Date and time of data generation 04:49, 10 April 2006
Lens focal length 11.5 mm
Image title OLYMPUS DIGITAL CAMERA
Orientation Normal
Horizontal resolution 72 dpi
Vertical resolution 72 dpi
Software used v772-79
File change date and time 04:49, 10 April 2006
Y and C positioning 2
Exposure Program Creative program (biased toward depth of field)
ISO speed rating 320
Exif version 2.2
Date and time of digitizing 04:49, 10 April 2006
Image compression mode 2
Exposure bias 0
Maximum land aperture 3.4
Metering mode Pattern
Light source Unknown
Flash 16
Color space sRGB
Custom image processing Normal process
Exposure mode Auto exposure
White balance Auto white balance
Digital zoom ratio 0
Scene capture type Standard
Contrast Normal
Saturation Normal
Sharpness Normal