I've seen similar discs and assumed they were shellac. I'd be interested to know definitively if this is the case.
Office of Presidential Libraries
National Archives and Records Administration
>>> John Dawson <[log in to unmask]> 8/1/2012 9:34 AM >>>
I am dealing with some press molded discs from 1947. They are 16", and appear to be made of vinyl. They are clearly pressings, not direct cuts. They are flexible and smell like vinyl. They appear to be the same material throughout. I was seeking some clarification as to whether or not these would be considered electrical transcriptions or not. Also wondering if there is another material besides vinyl these could be made from. They are in a collection that contains numerous radio programs, mostly on laquers. This appears to correspond with a slide show or film strip (you can hear the familiar bell that seems to correspond with scene changes). The audio is on one side, and the other side contains elaborate pressings of an RCA/Victor logo. The labels say "Produced by Vocafilm corporation".
Media Preservation Initiative