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 camshaft profile and its associated timing diagram for a 25 HP engine.
| Identifier | ExFiles\Box 102\5\ scan0052 | |
| Date | 12th May 1931 guessed | |
| Hs{Lord Ernest Hives - Chair} 349 CAMSHAFT 25 HP EXHAUST CAM LEADS INLET CAM BY 118° CAM FORM TO E 36951 1.314 .950 DIA -2 1 EX V L OF KEYWAY DIRECTION OF ROTATION A EX IN 2 EX 4 IN MR +39 +19 118° 60° 6° | ||