An all-electronic television system uses special types of cathode-ray tubes as camera tubes and as display tubes at the transmitting and receiving ends of the system respectively. The manufacture of these tubes could only be accomplished after much research and development activity had been expended on thermionic and secondary emission of electrons, electron optics, photosensitive and fluorescent materials, and vacuum practice.
Early electronic camera tubes, and the work of Farnsworth (c. 1920-1935), Page 1 of 2
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