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).
Specification table for Cams used in Spectre & 20/25 HP Steering Parts.
| Identifier | ExFiles\Box 28\3\ Scan203 | |
| Date | 27th September 1935 | |
| X 1300 27.9.35. SpectreCodename for Phantom III & 20/25 HP. Steering Parts. C A M S. L.H. for SpectreCodename for Phantom III. R.H. for 25 HP. No. | Hand | Lead | Bearings | Crowning | Our No. | Adamant No. 1 | L.H. | 0.800 | A | 0.005 | F.87551 | M.21238 2 | L.H. | 0.800 | A | 0.002 | | M.21508 3 | L.H. | 0.800 | T | 0.005 | F.87835 | 4 | L.H. | 0.700 | A | 0.002 | F.87681 | M.21477 5 | L.H. | 0.700 | T | 0.005 | F.87834 | 6 | R.H. | 0.800 | A | 0.005 | F.61001 | M.21115 7 | R.H. | 0.800 | A | 0.002 | | M.21533 8 | R.H. | 0.800 | T | 0.005 | F.60994 | 9 | R.H. | 0.700 | A | 0.002 | | M.21534 10 | R.H. | 0.700 | T | 0.005 | F.60995 | Hs{Lord Ernest Hives - Chair}/F.J.H. | ||