I just found this, it looks like it could be interesting:
https://archive.org/details/audiorecord4552newyrich
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Re: The Audio Record (Audio Devices publication archive)
I've browsed through about half of it. Some interesting articles on cutting styli both sapphire and steel, introduction of heated cutting, transition from standard to microgroove, and many pics of lathes in action; primarily Prestos and a few Scullys. Will definately download the PDF for better reading. There are some issues missing so some articles that are spread of multiple issues are missing parts. IIRC the one microgroove article is three parts of three issues. Thanks for the link and I'll be exploring more of the archive for other reference materials.