Table detailing different types of rollers for Spectre & 20/25 HP steering parts.
| Identifier | ExFiles\Box 95\1\ scan0222 | |
| Date | 27th September 1935 | |
| +350 Spectre(Codename for Phantom III) & 20/25 HP. Steering Parts. Rollers. Rollers are not handed and not affected by crowning. | No. | Lead | Type of Bearing | Our No. | Adamant No. | |---|---|---|---|---| | 1 | 0.800 | Adamant | F.87552 | M.21116 | | 2 | 0.800 | Timken | F.87756 | | | 3 | 0.700 | Ball | F.87682 | M.21504 | | 4 | 0.700 | Timken | F.87900 | | HS {Lord Ernest Hives - Chair} /F.J.H. | ||
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).