File:Nipkows apparat Tekniska museet.jpg
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Original file (4,014 × 4,530 pixels, file size: 3.11 MB, MIME type: image/jpeg)
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Summary
[edit]DescriptionNipkows apparat Tekniska museet.jpg |
Svenska: Paul Nipkows apparat i Tekniska Museet Stockholm
English: An early mechanical-scan television receiver from the 1930s. Dozens of early stations experimented with television broadcasting using these mechanical-scanning systems during the 1920s and 30s. It uses a Nipkow disk, a spinning metal disk with a spiral pattern of holes in it. A neon light behind the disk, shining through the holes, creates the scan lines of the TV image. The image is only about one inch (3 cm) square so it is viewed through the magnifying lenses shown. The video signal from the receiver (bottom) is applied to the neon light, varying its intensity, to create the different tones of the monochrome image. Different TV stations used different numbers of scan lines and frame rates, and this receiver has two lenses and two neon lights, so it was able to receive TV broadcasts with two different standards, probably a 48 line, 15 frames per second broadcast and a 60 line, 20 frames per second broadcast. |
Date | |
Source | Own work |
Author | Holger.Ellgaard |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 08:47, 16 December 2014 | 4,014 × 4,530 (3.11 MB) | Holger.Ellgaard (talk | contribs) | colour | |
14:11, 14 August 2012 | 4,146 × 4,614 (2.22 MB) | Holger.Ellgaard (talk | contribs) |
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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 | Panasonic |
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Camera model | DMC-TZ20 |
Exposure time | 1/4 sec (0.25) |
F-number | f/3.3 |
ISO speed rating | 400 |
Date and time of data generation | 13:14, 6 August 2012 |
Lens focal length | 4.3 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | ArcSoft PhotoStudio |
File change date and time | 09:46, 16 December 2014 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 13:14, 6 August 2012 |
Meaning of each component |
|
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.4453125 APEX (f/3.3) |
Metering mode | Pattern |
Light source | Cloudy weather |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 24 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |