[GreenKeys] TWX Services

[magwheels54 at yahoo.com]

Hello,
I’ve been trying to understand how the TWX service progressed. I have a 1949 Bell System publication on how to operate a model 19 to send a message via TWX service line to another teletype. In that publication, they have a photo of a bunch of women sitting in front of a TWX switchboard that has a model 14 send/receive typing reperforator with a bunch of wires manually moved across the switchboard to make connections with other teletypes. But in that same picture, there is a phone dial built into the switchboard.
I’m wondering what that phone dial was used for in 1949?

I understand that later on, like in 1959 or 1960, they used Dataphone, basically a dial up modem for teletypes to connect to each other via regular voice phone lines and used audio tones in an AFSK affair. And that later model Teletypes, like model 33 had a call control unit built in. Basically automating teletype switching via automated switchboard using regular phone network instead of TWX network.
Was the TWX network ever automated? Or did they use the manual operator switchboards until the Dataphone service was established on regular phone lines? Were older model teletypes, 19 or 28 ever retro fitted with a call control unit, similarly like model 33s? 
Hard to put this all together what happened there.

ThanksAndy
Sent from Yahoo Mail for iPhone
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