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X-ray tube 3
 

 

 

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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.
Date May 8th 2008 (see EXIF)
Source my own camera
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EXIF data:
File name x-ray_tube_3.jpg
Size, bytes 607987
Mime type image/jpeg
Image input equipment manufacturer NIKON CORPORATION
Image input equipment model NIKON D80
Orientation of image 1
Image resolution in width direction 3000000/10000
Image resolution in height direction 3000000/10000
Unit of X and Y resolution 2
Exposure time 10/1600
F number 38/10
Exposure program 3
ISO speed rating 800
Compressed bits per pixel 4/1
Exif version 0221
Lens focal length 450/10
Date and time original image was generated 2008:05:08 11:19:00
Date and time image was made digital data 2008:05:08 11:19:00
Meaning of each component 
Exposure bias 0/6
Maximum lens aperture 37/10
Metering mode 5
User comments ASCII
Supported Flashpix version 0100
Color space information 1
Exif image width 1826
Exif image length 756
InteroperabilityOffset 852
Sensing method 2
Scene type 
CFA pattern 
Digital zoom ratio 1/1
Focal length in 35 mm film 67
Gain control 1
Contrast 2
Interoperability index R98
Interoperability version 0100
Software used Adobe Photoshop CS3 Windows
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