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 P3 gearbox temperatures over time, comparing Cadillac gears with R.R. gears at full throttle.
| Identifier | ExFiles\Box 94\2\ scan0169 | |
| Date | 11th February 1937 guessed | |
| Temp °C Time - Mins Cadillac Gears R R Gears P3 Gearbox Temperatures Full Throttle 3rd Speed 1500 R.P.M. | ||