File:Détecteur à cristal de galène.jpg
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Original file (2,232 × 1,448 pixels, file size: 2.36 MB, MIME type: image/jpeg)
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Summary[edit]
DescriptionDétecteur à cristal de galène.jpg |
Français : détecteur à cristal de galène
English: Galena cat's whisker detector from an antique crystal radio. This antique radio component consists of a wire on an adjustable arm that touches the surface of a crystalline pebble of galena (lead sulfide). It formed a crude semiconductor diode, which allows current to flow in one direction but blocks current flowing in the other direction. It's function was to rectify the radio signal, changing it from alternating current to a pulsing direct current, to extract the audio (sound) signal from the radio frequency carrier wave. |
Date | |
Source | Own work • Self-photographed |
Author | F1jmm |
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I, the copyright holder of this work, hereby publish it under the following licenses:
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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:50, 6 March 2011 | 2,232 × 1,448 (2.36 MB) | F1jmm (talk | contribs) | {{Information |Description={{fr|détecteur à cristal de galène}} |Source={{own}} |Date= 2011-03-06 |Author=F1jmm |Permission= |other_versions= }} Category:Cat's-whisker detector |
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- Usage on fr.wikipedia.org
Metadata
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 PowerShot A420 |
Exposure time | 1/8 sec (0.125) |
F-number | f/2.8 |
Date and time of data generation | 10:21, 6 March 2011 |
Lens focal length | 5.4 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Windows |
File change date and time | 10:41, 6 March 2011 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 10:21, 6 March 2011 |
Image compression mode | 3 |
APEX shutter speed | 3 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 12,085.106382979 |
Focal plane Y resolution | 12,085.106382979 |
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 |