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).
Blueprint of a suggested balance hole in the sump to resolve oil level drop issues during a cold start.
| Identifier | ExFiles\Box 97\1\ scan0166 | |
| Date | 19th October 1938 guessed | |
| Rm{William Robotham - Chief Engineer} 528 PUMP PH III PARTS SUGGESTED BALANCE HOLE IN FRONT WEB OF SUMP AS TESTED ON WRAITH & BENTLEY III TO OVERCOME OIL LEVEL DROP WHEN STARTING UP COLD | ||