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 pump delivery in Pints per Hour against pump speed in RPM.
| Identifier | ExFiles\Box 179b\4\ img010 | |
| Date | 10th April 1933 guessed | |
| DELIVERY, PTS/HR, 500, 1000, PUMP SPEED R.P.M., 500, 1000, 1500, 2000 | ||