[GreenKeys] History of modems

[Sam Hallas]

Duncan Brown wrote:
> It is often hard to pinpoint the "first" of anything, but the for the
> "first" modem, I always think of the US Signal Corps' TH-5/TG:

I'm sure that's much too late, Duncan.

I have diagrams from 1935 for Voice Frequency Telegraph Converters used 
by the British Post Office, which are essentially modems. I'm sure that 
Bell and Western Union must have been using similar stuff in the US at 
that time.

Cheers,
Sam