You have to be careful with the word "telegraph".  It has been used generically for both hand sent Morse code and for teletypewriters.  Teletype Corp used the term "Printing Telegraph" for their machines up into the 1950s.  The military used the "/TG" suffix for both Morse telegraph and teletypewriter equipment.

In 1930, AT&T wanted to set up "Teletypewriter Exchanges" (TWX), just like they had for telephones, so that businesses could communicate over TTYs.  AT&T bought the Teletype Corp. at that time so that they could control the source of machines and lease out the service.  In Europe, a similar system, known as TELEX, was also set up in the early 1930s.  These systems were the original email service.

Have fun,

Duncan
K2OEQ





On 2/2/2025 6:32 PM, Bruce Gentry via GreenKeys wrote:

For a few weeks I have been viewing YouTube videos of the Connections Museum in Seattle, Wa. They are a living museum of telephone gear, especially the central office switching systems. They also have a display of operational Teletypes. However, how did one send a telegram via AT&T? Were the machines for communications within the telephone network offices only? For decades I have enjoyed the machines, but aside from Western Union and private networks on railroads, know very little else about how AT&T carried messages and who they carried them for.

   Bruce Gentry, KA2IVY


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