1. 1864 Radio-Wave Transmission

   James Maxwell develops formulae describing electromagnetic radiation, establishing the principle of radio-wave transmission.

2. 1878 Crookes tube

   William Crookes developes the Crookes tube, a precursor of the cathode ray tube

3. 1884 Paul Nipow

   Paul Nipow patents a type of television using a mechanical scanning system with a rotating disk.

4. 1893 Valdemar Poulsen

   Valdemar Poulsen invents Telegraphon, the first magnetic recorder.

5. 1900 R.A. Fessenden

   R.A. Fessenden transmits human speech by radio waves

6. 1904 John Flemming

   John Flemming invents diode vacuum tube

7. 1906 Flourescent screen CRT

   Flourescent screen CRT used as a receiver in a television system

8. 1906 Lee De Forest

   Lee De Forest patents a vacuum tube, a key component in communications devices

9. 1923 Vladimir Zworkin

   Iconoscope electronic television camera patented by Vladimir Zworkin. In 1924 he patents a receiver, making possible the electronic scanning system of television.

10. 1926 J. L. Baird

    J. L. Baird demonstrates television in public, using a mechanical scan system.

11. 1929 Color images transmitted

    Low definition color images transmitted between Washington and New York.

12. 1929 FM radio

    FM radio introduced

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