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).
Comparison of the weights of a Cadillac frame against two Phantom frames.
| Identifier | ExFiles\Box 96\4\ scan0037 | |
| Date | 10th January 1936 | |
| X 358 10.1.36. Weight of Cadillac Frame 563 lbs. Weight of Ph.II Frame (12' 6" wheelbase) 315 lbs. Weight of Ph.III " (11'10" wheelbase) 368 lbs. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||