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).
Data table converting measurements from inches to millimeters from a datum point.
| Identifier | ExFiles\Box 77\5\ scan0134 | |
| Date | 26th April 1917 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. -2- Contd. Inches. mm. from datum. 8.0 301.54 8.1 304.24 8.2 306.90 8.3 309.54 8.4 312.14 8.5 314.75 8.6 317.25 8.7 319.76 8.8 322.24 8.9 324.69 * 9.0 327.12 9.1 329.52 9.2 331.89 9.3 334.24 9.4 336.56 9.5 338.86 9.6 341.13 9.7 343.38 9.8 345.61 9.9 347.82 10.0 350.00 | ||