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).
Comparative study of three spray patterns labelled 2050, 2500, and 2950.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan114 | |
| Date | 7th January 1931 guessed | |
| SS{S. Smith} 15 2050 2500 2950 | ||