How Photos Were Transmitted by Wire in the 1930s

Re:How Photos Were Transmitted by Wire in the 1930s by caditinpiscinam on Wednesday March 13, 2024 @02:39PM (#39695563)

How did they get the incandescent bulb on the receiving end to switch on and off fast enough to avoid blurring the picture?

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Re:How Photos Were Transmitted by Wire in the 1930s by zdragnar on Wednesday March 13, 2024 @03:19PM (#39696127)

The video explains that they used a neon bulb, which is far more reactive to current changes than standard incandescent.

Incandescent lights produce visible light largely through heat of the filament, whereas neon lights emit by passing current through the gas, meaning that rapidly changing the current is more effective- the had e doesn't need to cool down like a filament to stop producing light.

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Re:How Photos Were Transmitted by Wire in the 1930s by clintfred on Wednesday March 13, 2024 @03:12PM (#39696019)

I think the video said it was a neon bulb, which reacted "fast enough".

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Re:How Photos Were Transmitted by Wire in the 1930s by waltwalther on Wednesday March 13, 2024 @03:14PM (#39696044)

A neon tube was used on the receiving end because it reacts more quickly to current. This is mentioned at about 6:45 into the video.

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