[GreenKeys] What's this Western Union keyboard,> device?

[Sam Hallas]

John Nagle wrote:
>     It was customary to type encrypted text in blocks of five letters,
> so that manual operators could retype it without losing sync. A wrong
> letter would only cause one wrong letter after decryption, but getting
> off by one position would turn all subsequent text into garbage.
> I don't know if this machine was set up to do that.

I noticed that the paper in the typewriter had 5-letter groups, though 
they weren't clear enough to read.

Sam


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