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).
The ignition advance curves required for a 20 HP engine.
| Identifier | ExFiles\Box 51\5\ Scan246 | |
| Date | 3rd February 1922 | |
| CURVES SHOWING THE IGNITION ADVANCE REQUIRED ON 20 H.P. ENGINE. (Figures supplied by Hs. {Lord Ernest Hives - Chair} 3.2.22) Gr {George Ratcliffe} I ROLLS-ROYCE. LIMITED PRINT ROOM 28 AUG. 24 DERBY | ||