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 showing the viscosity of Price's Motorine 'C' oil at various temperatures.
| Identifier | ExFiles\Box 72\1\ scan0020 | |
| Date | 20th April 1925 guessed | |
| Graph Showing Viscosity of Price's Motorine 'C' at various temperatures Y-Axis: Degrees Centigrade, 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0 X-Axis: Seconds, 1000, 2000, 3000, 4000, 5000 | ||