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 a machined component with manufacturing operations and dimensions.
| Identifier | ExFiles\Box 171\3\ img162 | |
| Date | 3rd May 1921 guessed | |
| MACHINE, TOOL, TOOL No, OPERATION, .125, .150, .150R, .275 -.10, 1.350, 1.350 +.25 -.25, 1.750 +.25 -.25, 12 HOLES DRILL .266 DIA +.00 -.10, SPOTFACE WITH .600 DIA +.25, CUTTER | ||