In Old Movies, Why The Dial Tone After Someone Hangs Up?
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摘要
Brace yourselves, we're about to get into some serious detail about telephone systems. Thanks to all the folks at Seattle's Museum of Communications! http://museumofcommunications.org/
They're also on YouTube at https://www.youtube.com/user/museumofcomm
...and Sarah has a personal blog specializing in the ongoing restoration of the 1923 Panel Switch at the Museum: http://revertive-pulse.tumblr.com/
Edited by Michelle Martin, @mrsmmartin
I'm at http://tomscott.com
on Twitter at http://twitter.com/tomscott
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and on Instagram and Snapchat as tomscottgo
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