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 unused Castrolite.
| Identifier | ExFiles\Box 97\5\ scan0214 | |
| Date | 11th May 1939 | |
| LABORATORY 11.5.39 S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} GRAPH. UNUSED CASTROLITE TEMPERATURE IN DEGREES CENTIGRADE SPECIFIC GRAVITY 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0 0.80 0.90 | ||