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Lost television broadcasts are composed of mostly early television programs and series that for various reasons cannot be accounted for in personal collections or studio archives. ==Reasons for loss== A significant amount of early television programming is not lost but rather was never recorded in the first place. Early broadcasting in all genres was live, sometimes performed repeatedly, because there was no means to record the broadcast or because content itself was reasoned to have little monetary or historical value. In the United Kingdom, much early programming was lost due to contractual demands by the actors' union to limit the rescreening of recorded performances. Apart from Phonovision experiments by John Logie Baird, and some 280 rolls of 35mm film containing a number of Paul Nipkow television station broadcastings, no recordings of transmissions from 1939 or earlier are known to exist. In 1947, Kinescope films became a viable method of recording broadcasts, but programs were only sporadically filmed or preserved. Tele-snaps of British television broadcasts also began in 1947 but are necessarily incomplete. Magnetic videotape technologies became a viable method to record and distribute material in 1956. Televised programming (especially that which was not considered viable for reruns) was still considered disposable, however, and what was recorded was routinely destroyed by wiping and reusing the tapes, until the rise of the home video industry in the late 1970s. The ability for home viewers to record programming was extremely limited; although a home viewer could record the video of a broadcast by kinescope recording onto 8 mm film throughout television history or record the audio of a broadcast onto audiotape beginning in the 1950s, one could generally not capture both on the same medium until super-8 debuted in the 1960s. (Attempting to film a television broadcast using the kinescope process, because it required positioning the camera squarely in the line of viewing of the screen and thus blocked the view of other people trying to watch, also was quite disruptive to the television viewing experience and is thus exceptionally rare among home movies. Audio recordings, which do not require obstructing the view of other viewers, are more common, and numerous copies of otherwise lost television broadcasts exist.) The mass availability of home video recording in the late 1970s and early 1980s was also a benefit for television producers and archivers; because video was now economical enough for even a home viewer to afford, networks could now afford to save all of their programming as well. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lost television broadcast」の詳細全文を読む スポンサード リンク
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