[GreenKeys] ebay "Teletype Message Numbering Module"

[Duncan Brown]

Jim,

Would Teletype Corp have used an "Automatic Electric" stepper switch??  
Didn't WE make similar units??

Duncan

On 08-Jan-14 11:08, Jim Haynes wrote:
> Teletype (and Western Unioni and Kleinschmidt) made message number 
> generating and checking machines.  In the case of this one the seller 
> didn't provide a front view, which should show wheels displaying the
> current message number.  These have cams to operate switches to
> encode the digits as Baudot characters.  The stepping switch in
> the middle sequences the characters and usually a wired-in channel
> identification.  The Teletype ones were typically used in torn tape
> switching equipment.
>
> You may be familiar with an earlier technology using the Teletype MXD
> 3-headed tape reader, where one of the heads held a tape containing
> the message numbers and channel identification.  Since it's a drag to
> punch such a tape manually, without errors, and since the tapes wear
> out, the mechanical numbering machine is an improvement.
>
> Western Union back in the 1940s had a message numbering machine with
> cam-operated switches.  Later they developed one using all stepping
> switches.  I'm not sure why - seems like it would have been much more
> costly to make that way.  This used a panel of neon lamps to display
> the number.  W.U. also used similar machines to check incoming message
> numbers automatically.
>
> jhhaynes at earthlink dot net
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