P3D Re: glass slides

["Norm in S.F." <normlehf@xxxxxxxxxxx>]

This makes sense.

During the war, the aluminum used as the base for the acetate-coated
recording blanks for radio transcriptions was replaced with glass.

The discs are consequently very fragile. Lots of historic recordings
have been lost.

Norm Lehfeldt

Bob Wier wrote:

> I was wondering about that myself - the fact it's during
> the war years also seems like it might be significant. I wonder
> if it was easier to get glass slide material than the celluloid/
> plastic film based materials - since glass was heavy and fragile,
> it would probably have been around on the home front more than
> thoses camera needing film for aerial recon or dragging around
> in foxholes...