Image:Crookes tube two views.jpg
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| This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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| Description |
Two photos of a Crookes tube; one by ordinary light and one showing it in operation lit by it's own fluorescence. The electrode to the left is the cathode or negative electrode. Electrons released by it are attracted toward the positive space charge in center of the tube, created by the positive anode at bottom, and they accelerate down the tube to the right. They hit the righthand wall of the tube, making the glass fluoresce green. The cross-shaped metal plate blocks the electrons, casting a cross-shaped shadow on the glowing wall, demonstrating that the electrons travel in straight lines. The cross can be folded down against the floor of the tube, showing it is the cause of the shadow. This 'Maltese cross' demonstration form of Crookes tube was first made by Juliusz Plucker in 1869, and was very popular around the turn of the century. Alterations to image: Cropped component images and combined into one image. |
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| Source |
Image:Schattenkreuzröhre-not_in_use-lateral_view-standing_cross.jpg and Image:Schattenkreuzröhre-in use-lateral view-standing cross.jpg |
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| Date |
2008-05-07 |
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| Author | ||||
| Permission (Reusing this image) |
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| Other versions | Image:Schattenkreuzröhre-not_in_use-lateral_view-standing_cross.jpg, Image:Schattenkreuzröhre-in use-lateral view-standing cross.jpg |
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 15:58, 7 May 2008 | 2,022×2,115 (512 KB) | Chetvorno | ({{Information |Description=Two photos of a Crookes tube; one by ordinary light and one showing it in operation lit by it's own fluorescence. Alterations to image: Cropped component images and combined into one image. |Source=[[:Image:Schattenkreuzröhr) |
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Metadata
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| Camera manufacturer | Canon |
|---|---|
| Camera model | Canon DIGITAL IXUS 850 IS |
| Exposure time | 2/1 sec (2) |
| F-number | f/3.2 |
| Date and time of data generation | 14:41, 29 March 2007 |
| Lens focal length | 6.142 mm |
| Orientation | Normal |
| Horizontal resolution | 180 dpi |
| Vertical resolution | 180 dpi |
| File change date and time | 14:41, 29 March 2007 |
| Y and C positioning | 1 |
| Exif version | 2.2 |
| Date and time of digitizing | 14:41, 29 March 2007 |
| Image compression mode | 5 |
| Aperture | 3.34375 |
| Exposure bias | 0 |
| Maximum land aperture | 3.34375 |
| Metering mode | Pattern |
| Flash | 16 |
| Color space | sRGB |
| Focal plane X resolution | 9102.2222222222 |
| Focal plane Y resolution | 9088.7573964497 |
| Focal plane resolution unit | inches |
| Sensing method | One-chip color area sensor |
| Custom image processing | Normal process |
| Exposure mode | Manual exposure |
| White balance | Auto white balance |
| Digital zoom ratio | 1 |
| Scene capture type | Standard |
