[Tig] Nazi "TV"

[Richard Kirk]

HI.

I have a copy of von Ardenne's Cathode-Ray Tubes (1936) in the 1939 
English translation. The film scanner described is a flying spot 
scanner, and the apparatus also describes a CRT screen. However, there 
is mention on page 493 of a Nipkow disc with extra slots for 
compatibility with the line and frame sync signals. However, around 
1935, there were two systems under development - brightness modulation 
and velocity modulation. For a while, velocity modulation (constant beam 
current, but sweep the spot faster) held promise because you could get 
more brightness out of the tubes  because the gun was always maxxed out. 
Velocity modulation could not work with a Nipkow disc without  huge 
accelerations.

The images were probably scans of genuine films. The Berlin station 
transmissions of 1935 had 180 lines, and you would see that on the clip.

There are many contenders for the first commercial TV system. The German 
system was broadcast to public theatres, and not sets in the home, 
despite the images of people looking at sets in the home in the clip. 
The British Baird and electronic 405 line system was broadcast to the 
home, but stopped when war broke out. The Japanese had experimental 
broadcasts too. The US system is the only one that was not interrupted. 
The British 405 line system came back after the war in the same format.

Cheers.
Richard Kirk

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