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KF5JRV > TODAY 27.01.19 15:37l 45 Lines 2301 Bytes #999 (0) @ WW
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Subj: Today in History - Jan 27
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Sent: 190127/1431Z 30153@KF5JRV.#NWAR.AR.USA.NA BPQ6.0.18
On January 27, 1926, John Logie Baird, a Scottish inventor, gives the
first public demonstration of a true television system in London,
launching a revolution in communication and entertainment. Baird’s
invention, a pictorial-transmission machine he called a “televisor,ö
used mechanical rotating disks to scan moving images into electronic
impulses. This information was then transmitted by cable to a screen
where it showed up as a low-resolution pattern of light and dark.
Baird’s first television program showed the heads of two ventriloquist
dummies, which he operated in front of the camera apparatus out of view
of the audience.
Baird based his television on the work of Paul Nipkow, a German
scientist who patented his ideas for a complete television system in
1884. Nipkow likewise used a rotating disk with holes in it to scan
images, but he never achieved more than the crudest of shadowy pictures.
Various inventors worked to develop this idea, and Baird was the first
to achieve easily discernible images. In 1928, Baird made the first
overseas broadcast from London to New York over phone lines and in the
same year demonstrated the first color television.
The first home television receiver was demonstrated in Schenectady, New
York, in January 1928, and by May a station began occasional broadcasts
to the handful of homes in the area that were given the General
Electric-built machines. In 1932, the Radio Corporation of America
demonstrated an all-electronic television using a cathode-ray tube in
the receiver and the “iconoscopeö camera tube developed by Russian-born
physicist Vladimir Zworykin. These two inventions greatly improved
picture quality.
The British Broadcasting Corporation (BBC) inaugurated regular
high-definition public broadcasts in London in 1936. In delivering the
broadcasts, Baird’s television system was in competition with one
promoted by Marconi Electric and Musical Industries. Marconi’s
television, which produced a 405-line picture–compared with Baird’s 240
lines–was clearly better, and in early 1937 the BBC adopted the Marconi
system exclusively. Regular television broadcasts began in the United
States in 1939, and permanent color broadcasts began in 1954.
73 de Scott KF5JRV
Pmail: KF5JRV@KF5JRV.#NWAR.AR.USA.NA
email: KF5JRV@ICLOUD.COM
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