[GreenKeys] Telephoto machines?

[Lester Veenstra]

And also use in the SONOGRAPH, a device well known to CTTs and CTMs.


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

> -- Chris Elmquist N?JCF

    No, it was called Teledeltos paper.   It's a simple resistive
coating (carbon plus copper thiocyanate in the final version)
which is burned off by power from the writing stylus.  It's
not electrostatic; that puts something onto the paper. This takes it
off.