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).
Data table for the Spectre Cam Form, detailing the cam lift for valve closing.
| Identifier | ExFiles\Box 93\5\ scan0025 | |
| Date | 7th October 1935 guessed | |
| Hs.{Lord Ernest Hives - Chair}1838. SpectreCodename for Phantom III Cam Form. Division | Cam Lift A - B Valve Closing 146 | 0 144 | .000128 142 | .000512 140 | .001152 138 | .002048 136 | .003200 134 | .004608 132 | .006272 131 | .007122 For other details see E.86370. | ||