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 tests comparing steering, suspension, and frame stiffness for Spectre, Cadillac, and Phantom II models.
| Identifier | ExFiles\Box 95\3\ scan0030 | |
| Date | 12th September 1934 guessed | |
| -2- Pivot load on stub axle ball end to turn road wheel when on grease plate, in centre position, full left lock and full right lock, taken in both directions, on :- (a) SpectreCodename for Phantom III (b) Cadillac Steering Box load to turn steering when from bottom of pendulum lever :- (a) SpectreCodename for Phantom III (b) Cadillac (c) Ph.II Softer Buffers, G.81436. Scheme for variable rating springs. Stiffness of frame :- (a) SpectreCodename for Phantom III (b) Cadillac. | ||