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 showing two different combustion chamber shapes.
| Identifier | ExFiles\Box 148\1\ scan0116 | |
| Date | 25th April 1939 guessed | |
| DIAGRAM SHOWING COMBUSTION CHAMBER SHAPE PISTON CROWN CYL. HEAD. CYL. BARREL INLET EXHAUST ALTA CAR & ENG Cº LTD | ||