Íomhá:Science_and_Invention_Television_1928.jpg
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Taispeáin leagan ardtaifigh den íomhá (1,138 × 633 picteilín, méid comhaid: 217 KB, cineál MIME: image/jpeg)
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Seo comhad as An Cómhaoin Viciméid. Tá an tuairisc as an leathanach tuairisc Cómhaoin a leanas thíos.
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Achoimriú
TuairiscScience and Invention Television 1928.jpg |
English: A woman watching an early homemade experimental mechanical television receiver in 1928, from Hugo Gernsback's magazine Science and Invention. During the 1920s some radio stations began broadcasting experimental television programs, which could be viewed by mechanical "televisor" receivers like this one. The video signal from the receiver (left) is applied to a neon lamp in the viewer (right). In front of the lamp a metal disk with holes rotates, creating the scan lines of the image. This created a dim monochrome orange image 1.5 inches (4 cm) square with 48 scan lines at 7.5 frames per second, visible within the viewing cone, which the woman is watching. These mechanical-scan television technologies never achieved images of sufficiently high quality to catch on with the public, and were superseded by electronic scan television broadcasts in the 1930s. Page scans of the above article How to build the S&I Television Receiver on Commons:
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Dáta | November 1928. This page scanned August 2008. |
Foinse | Science and Invention magazine, November 1928, Volume 16, Number 7, cover, published by Experimenter Publishing Co., New York, NY. This page was scanned by User:Swtpc6800 on an Epson Perfection 1240U at 300 dpi with half-tone de-screening enabled and stored as TIFF. The image was cropped and touched up in Adobe Photo Elements 5.0. This copy saved as a 150 dpi JPG. |
Údar | AnaithnidUnknown author |
Ceadúnas (Athúsáid a bhaint as an gcomhad seo) |
This 1928 issue of Science and Invention would have the copyright renewed in 1955. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. http://onlinebooks.library.upenn.edu/cce/ The search of the Renewals for Periodicals for 1954, 1955 and 1956 show no renewal entries for Science and Invention. Therefore the copyright on the magazine was not renewed and it is in the public domain. Science and Invention ceased publication with the August 1931 issue. A search of the copyright renewal records from 1951 to 1959 shows no entries for Science and Invention. All issues are in the public domain. |
Leaganacha eile | Image:Science and Invention Nov 1928 pg618.png |
Ceadúnú
Public domainPublic domainfalsefalse |
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Science_and_Invention_Television_1928.jpg |
Stair chomhaid
Cliceáil ar dáta/am chun an comhad a radharc mar a bhí sé ag an am sin.
Dáta/Am | Mionsamhail | Toisí | Úsáideoir | Nóta tráchta | |
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faoi láthair | 17:45, 9 Lúnasa 2008 | ![]() | 1,138 × 633 (217 KB) | Swtpc6800 | A slight adjustment of the rheostats and the picture come in clearly. This photo shows the complete television receiver connected to an ordinary radio set. The picture is seen in the cone. == Summary == {{Information | Description= A slight adjustment |
Úsáid comhaid
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Meiteasonraí
Tá breis eolais sa comhad seo, curtha, is dócha, as ceamara digiteach ná scanóir a chruthaigh ná a digitigh é.
Má tá an comhad mionathraithe as an bunleagan, b'fhéidir nach mbeidh ceann de na sonraí fágtha sa comhad atá athruithe.
Íomhátheideal | A slight adjustment of the rheostats and the picture come in clearly. This photo shows the complete television receiver connected to an ordinary radio set. The picture is seen in the cone.
Science and Invention, November 1928. Volume 16 Number 7. Photo from page 618. |
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Úinéir an chóipchirt | The copyright on the magazine was not renewed and it is in the public domain.
Published October 10, 1928 by Experimenter Publishing. New York, NY. |
Leithead | 2,276 px |
Airde | 1,267 px |
Gíotáin sa chomhpháirt | 8 |
Scéim comhbhrúite | LZW |
Comhbhrú picteilíní | Black and white (Black is 0) |
Treoshuíomh | Gnáth |
Líon na gcomhpháirt | 1 |
Taifeach íomhá i dtreo an leithid | 150 dpi |
Taifeach íomhá i dtreo an airde | 150 dpi |
Na bogearraí a úsáideadh | Adobe Photoshop Elements 5.0 Windows |
Dáta agus am athrú an chomhaid | 10:36, 9 Lúnasa 2008 |
Dathspás | Uncalibrated |