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).
Specific gravity graph plotting temperature against specific gravity for used Castrolite.
| Identifier | ExFiles\Box 97\5\ scan0215 | |
| Date | 11th May 1939 | |
| TEMPERATURE IN DEGREES CENTIGRADE SPECIFIC GRAVITY LABS 11.5.39 S.G. GRAPH USED CASTROLITE | ||