[GreenKeys] AN/UGC 74A and 74B

[Jeffrey Angus]

On 11/29/2010 9:57 PM, Don Robert House wrote:
> I have not figured out exactly what happens but I believe
> it is a combination of the type of lubricant, the type of
> ink in the ribbon, plus heat and the composition of the
> platen.
I suspect it is the material itself.
Some time in the '70s, the Japanese seem to have gone crazy
experimenting with "How to make cheap rubber" for drive
belts and phono idler wheels.

These things turn to black goo. Damned ugly to try and clean  up.

Partly I think the problem was partly nobody fully understood
that the stuff would polymerize and turn to crap.

And of course, if it was cheaper, by all means use it.

Took 15-20 years for it to happen, and by then, well, it was
everywhere.

Jeff-1.0
wa6fwi