17 Feb
2025
17 Feb
'25
9:35 a.m.
On 2/17/25 09:03, Jon Elson via cctalk wrote:
Teledeltos paper had a silver layer over a carbon
layer, and a spark
blew off the silver to expose the black carbon. (I think that's how it
worked, I haven't seen this stuff in decades!) It was used in early
machines for sending weather facsimile maps, for instance.
I think the stuff may still be available in single sheets for physics
demonstrations and perhaps for use in kymographs not using ink. I
checked up on availability perhaps 20 years ago, but not recently.
--Chuck