[GreenKeys] Western Union Technical Review

[Pete Lancashire]

They deserve to be professional scanned. Hopefully someday paper
copies will again show up and scanned.

Thank you for pointing us to them.

-pete

On 4/6/13, John Nagle <nagle at animats.com> wrote:
>   I've been reading through Western Union Technical Review from 1947
> to 1969:
>
> http://massis.lcs.mit.edu/archives/technical/western-union-tech-review/
>
>   There's a huge amount of technical detail there about how
> the telegraph system worked in the heyday of Teletype machines.
> The various switching systems, starting with Plan 1 for Morse
> code lines and continuing through Plan 59 are described.
> Many specialized devices were built that are forgotten today,
> such as the "page printer control unit" which did automatic
> word wrap for Teletype page printers.  There are detailed
> discussions of the Kleinschmidt and Teletype Model 28
> machines. (Reduced clutch wear was a big deal.)
>
>   Slowly, electronics starts to appear.  First thyatrons
> (nothing to burn out), then vacuum tubes, and finally transistors.
> There's a lot of technology overlap; the final reperforator-based
> systems had transistors in them.
>
>    Interestingly, Western Union had a magnetic drum based system
> as early as i955, but it was for inventory control and made by
> Teleregister.
>
> 				John Nagle
>
>
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