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摘要

描述
English: British inventor John Logie Baird and his first publicly demonstrated television system, with which he transmitted moving pictures March 25, 1925 at the London department store Selfridges. This was one of the first demonstrations of television technology. The selenium photoelectric tubes he used had such low sensitivity that human faces could not be televised due to their low contrast. So Baird used the two articulated ventriloquist's dummies shown, "James" and "Stooky Bill" (right), whose painted faces had higher contrast, and televised them speaking and moving. The banks of bright light bulbs were required to illuminate the faces enough to produce an image. His mechanical televisor system had a large spinning disk with 30 lenses mounted in it. As each lens passed across the subject it generated a scan line of the image. At the receiver a similar spinning disk with holes recreated the image. The image thus had a resolution of 30 scan lines, just enough to recognize a face. By the next year Baird was televising real human faces.

Caption: BEFORE THE FOOTLIGHTS OF THE TELEVISOR TRANSMITTER - The two ventriloquist's dolls, James and Bill - "the first television stars" - are held by Baird in front of the microphone and the mechanical eye that sees and hears everything that goes on in front of it.

Alterations to image: Rotated image a few degrees to justify it.
日期
来源 Retrieved August 15, 2014 from Orrin Dunlap, Jr., "The Televisor" in Popular Radio magazine, published by Popular Radio, Inc., New York, Vol. 10, No. 7, November 1926, p. 650 on AmericanRadioHistory.com.
作者 Orrin Dunlap, Jr.
授权
(二次使用本文件)
This 1926 issue of Popular Radio magazine would have the copyright renewed in 1954. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1953, 1954, and 1956 show no renewal entries for Popular Radio. Therefore the magazine's copyright was not renewed and it is in the public domain.
其他版本 The receiver Baird used with this system is shown in John Logie Baird and television receiver.jpg

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Public domain
本作品属于公有领域,因为其是于1929~1963年之间在美国出版,且无论其是否具有著作权声明,它并未进行著作权更新。更多信息请参考Commons:Hirtle chart/zh著作权更新日志。请注意该作品在其他对美国作品不适用较短期限法则的司法管辖区仍然受著作权保护(基于作者的逝世日期),如加拿大(作者过世后70年)、中国大陆(作者过世后50年,不包括香港和澳门)、德国(作者过世后70年)、墨西哥(作者过世后100年)、瑞士(作者过世后70年)及其他有本地条约的国家。

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Public domain
这个作品在美利坚合众国属于公有领域,因为它首次发布早于1929年1月1日,或于该日期之前在美国著作权局登记。

公有领域作品必须在美国以及来源国没有版权问题,才能上传至维基共享资源。如果此作品不是美国作品,这个文件必须要有一个额外的版权标记显示此文件在来源国的版权状态。
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