Hi,  I remember working a bit with the Sound Scriber, somewhere around
the late 1940's or early 50's.  My mother did Braille transcription,
and this recorder was being investigated as a means of making single
sound copies of things like some college books, where the low demand
did not justify conventional records of the time.  It is a voice
dictation quality recorder, certainly not high fidelity.

Using the thin plastic sheets, the recording stylus was nearly
spherical, and embossed a groove without any cutting.  If you didn't
mind further degradation of the initial mediocre quality, you could
toss a used disk in hot water, then lay it to cool on a cookie tin,
and the plastic would pretty much spring back and erase the recording.
Several repetitions of this raised the surface noise pretty badly.

Bill Earnest
Allentown, PA, USA