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 of viscosity curves for steering box oils, plotting temperature against time of efflux.
| Identifier | ExFiles\Box 67\4\ scan0386 | |
| Date | 29th August 1927 guessed | |
| VISCOSITY CURVES STEERING BOX OILS TEMPERATURE IN C° TIME OF EFFLUX SECS ISOVIS MOTORINE B MOTORINE C LARD OIL SPERM MOBILE E | ||