[78-L] One-sided lacquer disc

[David Lennick]

I came across this one today, in a collection I'd picked up years ago in 
Montreal. Steel-based disc containing a speech recorded in England, early in 
the war (the contents don't matter), with only a few fragments of the label 
remaining..lines on a white background and part of a stroboscope pattern. The 
disc itself is coated only on one side, a bit of flaking shows the silver 
colour underneath (and the thing weighs a ton and could do serious damage), but 
the reverse also has some kind of coating, dark copper in color. Why would only 
one side have been given a lacquer coating?

dl