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Secondary School D.Afonso Sanches

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The first stepYou cannot say precisely who

invented the television, because manyscientists have contributed in one way or

another to the invention. In the 20s, thegreat quest of scientists was trying togather and transmit sound waves, whichhad already succeeded with the inventionof radio, but with moving image.

Ernst F. W. Alexanderson

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The first television sets were likeradios, but only with a mechanicalturntable which produced an image

the size of a postage stamp.The first broadcast happened to just

three houses.

1939 GE HM171

1934 Pioneer-TM3 Russian TV

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y Due to technological and economic advances afterWorld War II, television became popular. Until thistime, the entire image was in black and white.

American family watching TV,1958

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yA color television appeared in theUnited States in 1954 and was based ona technology that did not requirechanges in the black and white oldtelevisions to reproduce color images.

yCurrently, digital TV is the most

used, with forms of modulation andcompression of images that allow ahuge increase in the picture quality.

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Work produced by:

Ana Rita Cerqueira N1 10D

Antnio Azevedo N5 10D

Bruna Sofia N7 10D

Catarina Waterland N10 10D

Juliana Pena N15 10D

THE END