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).
Blueprint graph comparing the acceleration performance of various Rolls-Royce and Bentley 6-cylinder cars.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan036 | |
| Date | 9th August 1926 guessed | |
| COMPARISON OF R.R. AND BENTLEY 6 CYL CARS ACCN. FT/SEC² ROAD SPEED M.P.H 6.5 LITRE BENTLEY STANDARD PHANTOM TOURER BENTLEY READINGS x x x SPORTS PHANTOM 10 EX | ||