Original source link:
https://youtube.com/watch?v=cLUD_NGE370
How photos were transmitted by wire in the 1930s
11–20 of 117 posts
Re: How photos were transmitted by wire in the 1930s
#12In it's simplicity it is genius. I had no clue this was a thing. https://en.m.wikipedia.org/wiki/Wirephoto I really like these old "explaining" films. The pedagogical level is far higher than what seems common today. And the they take their time to convey the message.
A couple other good ones:
How Differential Steering Works (1937) https://www.youtube.com/watch?v=yYAw79386WI
Flak (1943) https://www.youtube.com/watch?v=H8zPNMqVi2E
Re: How photos were transmitted by wire in the 1930s
#13Tangential, but was there ever some form of fibre or telephony connection for news crews in 1990s? Microwave trucks excluded. I ask this because I swear, as a kid, I’ve seen a cameramen open up a telecom/telephone box and connect something to it. I assumed it was for an uplink back to the station to transmit video.
Absolutely. From the advent of radio broadcasting telephone lines were used for everything, audio and even DC signalling to control relays. All remote radio broadcasts used at least two lines. One for sending sound back to the station and a 2nd pair (telephone lines are a balanced pair of wires) for "cue" that came from the master control room to the remote site. Since most transmitters were located outside of city l…
they would have had the operator reverse the charges I assume?
by the way the old bell system technical journals are a fun read and are generally available at places like archive.org
Re: How photos were transmitted by wire in the 1930s
#14How did they get the incandescent bulb on the receiving end to switch on and off fast enough to avoid blurring the picture?
Re: How photos were transmitted by wire in the 1930s
#15That scene (around 3:45) with the two, coupled spools of rope that transmit the picture from one spool to the other is simply amazing.
Re: How photos were transmitted by wire in the 1930s
#16How 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
#17In it's simplicity it is genius. I had no clue this was a thing. https://en.m.wikipedia.org/wiki/Wirephoto I really like these old "explaining" films. The pedagogical level is far higher than what seems common today. And the they take their time to convey the message.
AT&T's "Similarities of Wave Behavior" is incredible.
Re: How photos were transmitted by wire in the 1930s
#18Tangential, but was there ever some form of fibre or telephony connection for news crews in 1990s? Microwave trucks excluded. I ask this because I swear, as a kid, I’ve seen a cameramen open up a telecom/telephone box and connect something to it. I assumed it was for an uplink back to the station to transmit video.
This is also how live radio broadcasts were made. I'm old enough to have been a part of shows performed at the West End, mixed across the street in the studio, and broadcast from the World Trade Center downtown.
Re: How photos were transmitted by wire in the 1930s
#19In it's simplicity it is genius. I had no clue this was a thing. https://en.m.wikipedia.org/wiki/Wirephoto I really like these old "explaining" films. The pedagogical level is far higher than what seems common today. And the they take their time to convey the message.
>I really like these old "explaining" films. The pedagogical level is far higher than what seems common today. And the they take their time to convey the message. I wonder what happened? I have been blown away by some of the older explainer videos from the 40s and 50s, esp. some of the military training videos for vehicle repair, electrical engineering, etc. Very concise and very clear explanations, always with visua…
The one about how a differential works is fantastic. It just goes step by step through showing the problem to incremental improvements until the final gearing system is “simple”.
Re: How photos were transmitted by wire in the 1930s
#20Fax machines go way back to the 1800s, before phones, surprisingly old! Another classic is Tim Hunkin’s secret life of the fax machine https://youtu.be/yuUyt9RG7pk which features a clip from the video in TFA.