The Talking Machine Forum — For All Antique Phonographs & Recordings

The APS magazine for June 2018 contained a seven page article on fibre needles, which were invented by Frederick hall of Chicago.
This original Hall instruction sheet is included in a job lot of needle packets on UK eBay.

https://www.ebay.co.uk/itm/40700-Old-Vi ... 1438.l2649