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 and water temperature against time from a cold engine start at 900 RPM.
| Identifier | ExFiles\Box 131\1\ scan0103 | |
| Date | 23th May 1933 guessed | |
| TIME TO WARM OIL, ENGINE STARTED FROM COLD, RUN AT 900 R.P.M. OIL 50°C IN 38 MINUTES. WATER 3 PER II WATER 4 PER II OIL AIR TEMP 23°C TEMPERATURE °C TIME - MINS | ||