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).
Graph plotting Revolutions Per Minute against Miles Per Hour.
| Identifier | ExFiles\Box 181\M7\ img063 | |
| Date | 28th May 1928 | |
| MILES PER HOUR REVS: PER MIN Y-Axis: 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 X-Axis: 2000, 2250. SION. [Faint Stamp] ROLLS-ROYCE LTD 28 MAY 1928 | ||