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).
Laboratory graph showing the viscosity curve for used Castrolite oil, plotting temperature against efflux time.
| Identifier | ExFiles\Box 97\5\ scan0212 | |
| Date | 11th May 1939 | |
| LABORATORY VISCOSITY CURVE USED CASTROLITE TEMPERATURE IN DEGREES CENTIGRADE TIME OF EFFLUX IN SECONDS FROM REDWOOD No. 1 VISCOMETER | ||