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).
The placement of the tank and filler cap to conform to the body shape.
| Identifier | ExFiles\Box 90a\4\ Scan017 | |
| Date | 14th February 1936 guessed | |
| importance that the tank should conform to the shape of the body + that the filler cap should be at the apex of the rail . F.E.H | ||