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 titled 'Low Compression' plotting data against Revolutions Per Minute.
| Identifier | ExFiles\Box 183\M22\ img080 | |
| Date | 5th May 1921 | |
| LOW COMPRESSION. Revs: Per Min: 1500 1750 2000 2250 0 5 10 15 20 25 30 ROLLS-ROYCE LTD. PRIVATE ROAD - 5 MAY 1921 DERBY | ||