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Good find.  I had not realized that AudioDiscs went back into the glass
business in 1951. I guess I could have seen them listed on their price
list.  If all you needed the disc for was to bring it over to the
plating room and have it electroplated, then glass was ideal.  But
despite that currently and in the past couple of decades there are very
few people who use lacquers for any other purpose, I don't think any of
the few remaining lacquer manufacturers have glass base discs in their
product line.  (Scratch jocks cut their "dub plates" on uncoated vinyl.)

Mike Biel  [log in to unmask]  

From: George Brock-Nannestad <[log in to unmask]>
From: Patent Tactics, George Brock-Nannestad
> Hello Mike,
> to your very thorough discussion of glass vs. metal I can add the
> following reference: 
> Audio Record Vol. 7, No. 3, pp. 1-2, March 1951
> - this is the magazine of Audio Devices, and they discuss the advantage of 
having the much smoother surface of glass to use as a base, and they
sound 
clearer. Surface roughness graphs of iron, aluminum and glass are shown
(and 
if they have not cheated), the glass is very much smoother. They claim
that 
their process is much improved over the wartime ones.

> Audio Record may be found on the internet archive.
> Best wishes,  George