From: Patent Tactics, George Brock-Nannestad


Michael Shoshani wrote:

> To my knowledge, the general practice, at least in England, was to heat 
> the wax to nearly 100 degrees F in a purpose-built oven, rather than 
> heating the stylus. Both HMV and Columbia (and later EMI) were doing 
> this in the studio and in mobile recording trucks, although I have no 
> idea whether this was done by their remote engineering crews traipsing 
> all over Europe, Asia, the Near and Middle East, and Africa.

----- furthermore, an incandescent bulb (lit) was placed inside the recording 
machine to keep it at a reasonable temperature. This would also serve to the 
minimize any temperature shock of placing the warm wax on the machine. An 
inhouse rule, which was early and stemmed from VTMC in the acoustic days was 
that the wax should be at blood temperature. 

The Danish broadcasting used wax in the 1930s, and they heated the wax for 
recording and refrigerated it before replay. This reduced the wear.

Kind regards,