[GreenKeys] Model 35, blinded mode

[John Nagle]

> Subject: [GreenKeys] Model 35
> To: "Greenkeys Greenkeys"<greenkeys at mailman.qth.net>
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> Still working to understand the Model 35 I aquired.....why would the machine
> have a "KB Unblind" function.
>
> In other words....why would a KB be "blinded" in the first place?  Seems to
> me you just don't type if you don't want the KB functional.

    Typing "blind" means you don't get to see what you've typed.
Operating in that mode was quite common in the telegram era.

    Watch "Telegram for America",
("http://www.archive.org/details/Telegram1956"),
which shows Western Union operations from the 1950s.  Note
that all the Western Union operators type blind.  Most are
operating non-printing keyboard perforators.

    That movie also shows Plan 55-A switching centers
(fully automatic, paper tape buffering), and what I
think is a Plan 21-A system (pushbutton routing,
paper tape buffering).

				John Nagle