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).
Ignition governor characteristics for the B.III No.2 unit.
| Identifier | ExFiles\Box 97\1\ scan0115 | |
| Date | 4th February 1938 | |
| To Rm{William Robotham - Chief Engineer}/RC.{R. Childs} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/MH.{M. Huckerby}4.2.38. γ 20°B 400 BENTLEY III. IGNITION CHARACTERISTICS. For B.III No.2 unit the following ignition governor characteristic is required and should be fitted as soon as possible. R.P.M. Advance. Engine Flywheel 250 Start 500 5° +2° 750 9° " 1000 13° " 1500 18° " 2000 21° " 2500 23° " 3000 25° " 3500 27° " Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||