From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint detailing specifications and manufacturing instructions for a mechanical component with ring grooves.
| Identifier | ExFiles\Box 173\3\ img021 | |
| Date | 2nd June 1940 guessed | |
| SIDES OF RING GROOVES MUST BE SMOOTH, FLAT, & RUN TRUE WITH SKIRT O.D. - THE BOTTOM OF GROOVES MUST BE SQUARE WITH THE SIDES .1255 .1265 .125 .126 .1875 .1885 GRIND CHAMFER SAW - 2 SLOTS BEFORE FINISH GRINDING BREAK CORNER 3.299 CAM 3.237 GRIND BREAK CORNER 1/64 MAX. R.{Sir Henry Royce} 3/32 7/64 C 3/32 1/2 29/32 7/8 21/32 1 1/2 | ||