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).
Request to Penn Birmal Smethwick for six spare scraper rings for Autothermic pistons.
| Identifier | ExFiles\Box 148\3\ scan0251 | |
| Date | 3rd August 1937 | |
| 122/6 Rm{William Robotham - Chief Engineer}/huts. 3.8.37. PENN BIRMAL SMETHWICK. PLEASE SEND SIX SPARE SCRAPER RINGS FOR AUTOTHERMIC PISTONS. ROYCAR. | ||