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).
Diagram highlighting leakage and uneven seating on a 30 HP oil filter assembly.
| Identifier | ExFiles\Box 130\2\ scan0012 | |
| Date | 1st July 1919 guessed | |
| GUL. 19 & 42. R.R. 30 HP. OIL FILTER TO CRANKCASE. THE FACE OF THIS SEATING UNEVEN BY .010" LEAKAGE BETWEEN ALUMINIUM CASTING & BRASS PRESSING | ||