File:Crookes_tube-not_in_use-lateral_view-standing_cross_prPNr°07.jpg
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DescriptionCrookes tube-not in use-lateral view-standing cross prPNr°07.jpg |
English: Lateral view of a Crookes tube, an experimental vacuum tube invented by William Crookes around 1875. This is a common type used for demonstrations, first built by Juliusz Plucker. It has a plate in the shape of a Maltese Cross, which can be folded down against the floor of the tube. When a high voltage is applied between the cathode on the left and the anode at the bottom, cathode rays (electrons) are emitted by the cathode, and travel from left to right, striking the glass end wall of the tube, making it fluoresce with a yellow-green glow. When the cross is standing up, as here, it casts a cross shaped shadow on the glowing end wall, showing that cathode rays travel in straight lines. Deutsch: Seitenansicht einer Form der Schattenkreuzröhre mit aufgerichtetem Kreuz die in der deutschen Wikipedia beschrieben wird. |
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Date | Taken on 29 March 2007 | |||||||
Source | Own work | |||||||
Author | D-Kuru | |||||||
Permission (Reusing this file) |
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29 March 2007
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b57a446d2c56608798621a43966ff53cf4fb0a0a
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:58, 12 April 2007 | 3,072 × 2,304 (2.33 MB) | D-Kuru | {{Information |Description= {{en|Lateral view of a sort of a Crookes tube described in the german Wikipedia with a standing Cross}} {{de|Seitenansicht einer Form der Schattenkreuzröhre mit aufgerichtetem K |
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Camera manufacturer | Canon |
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Camera model | Canon DIGITAL IXUS 850 IS |
Exposure time | 1/125 sec (0.008) |
F-number | f/4.5 |
Date and time of data generation | 14:22, 29 March 2007 |
Lens focal length | 10.833 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 14:22, 29 March 2007 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 14:22, 29 March 2007 |
Image compression mode | 5 |
Shutter speed | 6.96875 |
APEX aperture | 4.34375 |
Exposure bias | 0 |
Maximum land aperture | 4.34375 APEX (f/4.51) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Color space | sRGB |
Focal plane X resolution | 13,653.333333333 |
Focal plane Y resolution | 13,633.136094675 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |