File:Geissler tubes (switched on).jpg
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DescriptionGeissler tubes (switched on).jpg |
English: A modern electrical artwork that is an imitation of a Geissler tube, a gas discharge tube invented by Heinrich Geissler in 1857. It consists of a series of glass tubes filled with various gases at low pressure, with metal electrodes at each end. A high voltage of several thousand volts is applied between the electrodes. The high voltage ionizes the gas causing it to give off light by fluorescence in a glow discharge. The color of the light depends on the gas used. Geissler tubes like this of many elaborate shapes and colors were made for entertainment starting around 1860 until the turn of the 20th century. By the 1920s this technology was commercialized in neon signs.
Русский: Лампы Гейслера |
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Date | |||
Source | Geissler Tube | ||
Author | Paul Downey from Berkhamsted, UK | ||
Permission (Reusing this file) |
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:50, 15 August 2008 | 2,250 × 2,378 (1.8 MB) | File Upload Bot (Magnus Manske) (talk | contribs) | {{Information |Description= |Source=[http://www.flickr.com/photos/45581782@N00/308088417/ Geissler Tube] * Uploaded by Pieter Kuiper |Date=November 26, 2006 at 13:14 |Author=[http://www.flickr.com/people/45581782@N00 Paul Downey] |
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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | Canon |
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Camera model | Canon DIGITAL IXUS 850 IS |
Exposure time | 1/30 sec (0.033333333333333) |
F-number | f/3.2 |
Date and time of data generation | 13:14, 26 November 2006 |
Lens focal length | 6.142 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | QuickTime 7.1.3 |
File change date and time | 22:04, 27 November 2006 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 13:14, 26 November 2006 |
APEX shutter speed | 4.90625 |
APEX aperture | 3.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Sensing method | One-chip color area sensor |