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English: A long wave galena crystal radio receiver. Made by Heliogen in Germany, 1935. The tuning coil is visible, mounted on the top. The wire is wound in a special pattern called a spiderweb coil, to reduce resistance at radio frequencies.
Français : Poste a cristal
|Source||Own work (Own photo)|
(Reusing this file)
GNU Free Documentation License
|Camera manufacturer||NIKON CORPORATION|
|Camera model||NIKON D40|
|Orientation of image||1|
|Image resolution in width direction||300|
|Image resolution in height direction||300|
|Unit of X and Y resolution||2|
|Exposure time||10/130 sec (0.076923076923077)|
|F number||f / 5|
|ISO speed rating||800|
|Compressed bits per pixel||4|
|Lens focal length||40 mm|
|Date and time original image was generated||2009:02:07 15:55:05|
|Date and time image was made digital data||2009:02:07 15:55:05|
|Meaning of each component|
|Maximum lens aperture||4.6|
|Supported Flashpix version||0100|
|Color space information||1|
|Exif image width||3008|
|Exif image length||2000|