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).
Governor specification for 66258U distributors, detailing advance degrees versus speed.
| Identifier | ExFiles\Box 168\3\ img244 | |
| Date | 13th March 1940 guessed | |
| GOVERNOR SPECIFICATION for 66258U DISTRIBUTORS. Advance Degrees. Speed R.P.M. Start . . . . . . . . . . . . 150-175 1/2 deg. + 1deg. . . . . . . . . 250 3 1/2 deg. .. .. . . . . . . . . 500 9 deg. .. .. . . . . . . . . 750 11 deg. .. .. . . . . . . . . 1,000 13 deg. .. .. . . . . . . . . 1,250 14 1/2 deg. .. .. . . . . . . . . 1,500 15 1/2 deg. .. .. . . . . . . . . 1,750 Direction of rotation clockwise looking on the rotor. Total range 15 1/2 deg. + 1. | ||