[GreenKeys] Telegraph Signal Analyzer

[Robert Nickels]

Thanks for the explanation - it makes sense the new gizmo would be 
called a "printing telegraph", just like other new gizmos were called 
the  "wireless telephone" and "talking pictures" ;-)   Every new 
technology is seen in the context of what came before.

This did remind me of a question I've had about news teletypes.     When 
I worked at radio stations in high school and college, we'd routinely 
order up dedicated lines from the telco for special broadcasts, but that 
was audio, and you'd pay for the duration the circuit was up.   The AP 
or UP and weather teletypes ran from permanent lines (provided by the 
telco too I think) -  but those had to be copper, right?  Or did they 
send audio and convert it to current loops at the machine?     There 
would obviously be a limit on how far they could run a current loop 
signal, so it would make sense to convert to audio tones, or they use 
some sort of regenerator?     I would guess that local telcos 
distributed the signals on behalf of the originator (i.e. UPI, AP, 
National Weather Service, etc) to the radio and tv stations, newspapers, 
etc who subscribed to those services.

I remember there being interface boxes on the wall but never knew what 
they actually did.     My only concern was to make sure the machines 
didn't run out of paper so you'd have something to "rip and read".

73, Bob W9RAN