Blueprint showing a cross-section of a machined part with dimensional annotations.
| Identifier | ExFiles\Box 171\3\ img161 | |
| Date | 3rd May 1921 | |
| No, OPERATION, MACHINE, TOOL No, PIECE No CAST HERE, .050R, .150, .125, 2.125, 9.300, 3.300 +2 -1, 1.050 +2 -1, .812 +2 -1, 1.750 +2 -1, .300, A, R.R. BDC (89017S)-400. (3. 5. 21.) | ||
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).