Atlas 10-inch lathe screwcutting charts
The first manual for the original 10-inch Atlas did not include the screwcutting data - but later editions did, the makers including card inserts to allow the chapter to be included later. To make up for this I can supply the extensive thread-cutting instructions and dedicated charts from what was known as the 61-page "Supplementary Screwcutting Instruction Booklet".