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 table of test results for Vacuum Gear oil and Battersea Gear Oil B.
| Identifier | ExFiles\Box 144\1\ scan0029 | |
| Date | 9th September 1912 guessed | |
| 5 letter. We may add, however, that our letter was drafted a day or two ago but when we began to transcribe the tables it was found that some particulars were wanting and further tests had to be made. Vacuum Battersea Gear oil Gear Oil B Specific Gravity @ 60F........ 0.897 0.930 Viscosity @ 60F. Redwood...... ---- ---- " @ 130 " " ........ .471. 2008 " @ 212 " " ........ 89 212 Flash Point - Close........... 405 520 " " Open............ 455 570 Fire Test .................... 535 626 Free fatty acid .............. 0.168 0.34 Fatty matter.................. Nil Nil Evaporation on exposure for 1 hour @370°F) 1.54 0.4 | ||