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).
Performance graph for the Feuerheerd - Stothert and Pitt Pump No 4163, plotting delivery against pump speed.
| Identifier | ExFiles\Box 149\2\ scan0045 | |
| Date | 24th November 1931 guessed | |
| HS{Lord Ernest Hives - Chair} 472 FEUERHEERD - STOTHERT AND PITT PUMP No 4163 SUCTION LIFT 12 FT: PRESSURE HEAD 12 FT: 75/25 PETROL. DELIVERY - PTS/HR. PUMP SPEED R.P.H. 3000 2500 2000 1500 1000 500 500 1000 1500 2000 | ||