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).
Comparison of properties for three different types of engine oil.
| Identifier | ExFiles\Box 144\1\ scan0030 | |
| Date | 9th September 1912 guessed | |
| 6 B C Vacuum Vacuum Motorine Engine oil. Engine oil. B Specific Gravity @ 60°F 0.892 0.892 0.896 Viscosity @ 60°F Redwood 4868 4560 4860 " @ 130 " 391 387 398 " @ 212 " 80 80 86 Flash point - Close 360 390 435 " " Open 430 435 480 Fire Test 470 480 560 Free Fatty Acid 9.34 9.34 0.22 Fatty matter 9.34 9.06 Evaporation on exposure for 1 hour @ 370°F 1.93 2.06 1.4 | ||