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).
With calculations and a sketch concerning driver visibility by lowering the radiator.
| Identifier | ExFiles\Box 26\1\ Scan070 | |
| Date | 1st November 1961 | |
| Visibility S-B By lowering rad 1/2" blind line is brought nearer by 3.6% " " " 1" " " " " - 7.13% Present range = 36' 5" 1/2" drop = " - 15.75" 1" " = " - 31.25" Nov. 1961 | ||