Three proposed engine improvements for filtration, oil cooling, and oil drawing.
| Identifier | ExFiles\Box 141\2\ scan0165 | |
| Date | 30th December 1938 guessed | |
| ①. IMPROVE filtration by putting a tube in crank main journals to keep sludge there ②. Improve the bottom half oil cooling. ③. Improve method of drawing oil from the bottom half leaving sediment to sink. | ||
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).