(1) While Hittorf and William Crooks1869 --------> Cathode Ray
(2) Maxwell
1869 --------> Theory of Electromagnetic Radiation
(3) Edison
1883 --------> Observed Electronically Conduction in a Vacuum
(4) Hertz
1888 --------> Radiowave but predicted by Maxwell
(5) J.J Thomson
1897 --------> Measure e- (1.6021x10-19 coulomb)
m (9.109x10-31 Kg)
(6) Marconi
1901 --------> Interested Wireless Communication
(7) Marconi
1904 --------> Interested Photoelectric Effect
(8) Fleming
1904 --------> Invented 1st Electronic Tube (Vacuum Diode)
(9) De.Forest
1906 --------> Vacuum Triode
(10) Armstrong
1912 --------> Oscillator
(11) Zworykin
1924 --------> Picture Tube
(12) Watson Watt
1939 --------> Radio Detection & Ranging (RADAR)
(13) Postwar
1942 --------> Demands and increase knowledge of Semiconductor
(14) Schockley, Bardeen, Bretain
1947 --------> Transistor
(15) Peason
1954 --------> Silicon Soloar Cell
(16) Townes
1953 --------> MASER (used in RADAR) with the help of Stimulated Emission
of Radation concept of Einstien in 1917.
(17) Kilbey
1958 --------> Integrated Circuits (IC's)
(18) Maimon
1960 --------> Ruby Lazer (Schowlows concept 1958 that MASER's Principle
into Optical region)
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