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).
List of development points for Spectre, B-12, and Bentley components.
| Identifier | ExFiles\Box 82\4\ scan0127 | |
| Date | 11th May 1935 | |
| -3- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/KW.11.5.35. (4) SpectreCodename for Phantom III silent tappets with 8 - 1 eccentric ratio. (5) B-12 unit supercharger experiments, Hs{Lord Ernest Hives - Chair}/Smth.3/KW.4.3.35. Hs{Lord Ernest Hives - Chair}/Smth.23/KW.8.3.35. Diffuser type supercharger to Ex.17516. (6) Bentley type crankshaft with large four bolt rear main bearing, Borg & Beck 11" clutch, and crankcase to suit N.Sch.4419, LeC.4350. (7) Silent tappet head for Bentley. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||