Thanks, everybody, for your responses to my question. I guess I'm
showing my age to be able to even ask such a question.

Eisenglass - that is what I was after. A natural mineral with lots of
alumina, silica, and potassium that is brittle, translucent to
transparent, can be split into very thin sheets, can withstand very high
temperatures, and WAS used before window glass became prominent. I guess
there still are uses for it.

Thanks again,

Regards,

John Rodgers
88 GL Driver

John Rodgers wrote:
> Can anyone tell me just what isenglas is, and where it has been used in
> the auto world. I seem to remember something about Henry Ford, the Model
> T, and isenglas windows or headlights or lamp covers or something. It
> has been a long time. But it let light through. The few references I hav
> found so far call it "plastic". I don't think that is right.
>
> Anyway, I would appreciate any feedback.
>
> Thanks,
>
> John Rodgers
> 88 GL Driver
>
>