[GreenKeys] "Projection Telegraph"?

[John Lawson]

On Thu, 3 Feb 2005, Tom Norris wrote:

> OK, this looks like a regular strip printer. Then I saw
> the label that says it is a "TT-77/UG - a unit of printer
> projector teletypewriter TT-71/UG" The contract number
> on the tag seems to indicate it is a piece of Navy gear.

   I think I saw one of these once, years ago in a surplus shop. It was in 
a big steel cabinet with a frosted-glass screen on the top, about 6' tall, 
maybe 3' wide, 3' deep - been 30 years - don't quote me on the dims... ;}.

   Anyway, the printer fed the tape under a species of epidiascope - a very 
bright light was focussed onto the tape, and then the image was directed 
through mirrors and lenses onto the rear of the screen, thus being able to 
be read at a distance, or by multiple folks.

   I do not remember if there were facilites to 'loop' the printed tape 
back and forth to keep more of the message traffic on the screen - but 
that might have been possible.

Cheers
John  KB6SCO