Analogue/vector character generator - anyone remember the URL?

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Hi cctalkers,

A while back there was a URL posted somewhere on this list about a
(1950s?) character generator which worked solely by mixing harmonics,
with X-Y output to connect to a display tube. It could only generate
the digits 0-9, but was a seriously impressive piece of kit
nonetheless.

I recently wanted to show this to a friend, and couldn't find it with
any amount of Googling.

If someone can remember this site, or has it bookmarked, I'd be
endlessly grateful for the URL.

Thanks,

Ed.