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 oil flow through bearings against engine RPM for car 12.EX at a pressure of 17.5-27 lbs/sq in.
| Identifier | ExFiles\Box 72\1\ scan0132 | |
| Date | 6th May 1926 guessed | |
| OIL FLOW THROUGH BEARINGS ON CAR. 12.EX PRESS 17.5 - 27 lbs/□'' OIL FLOW PTS/MIN 0 1 2 3 R.P.M. 500 1000 1500 2000 2500. acp. | ||