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).
Experiment with 7-ringed pistons, part number X.2369A.
| Identifier | Morton\M11\ img026 | |
| Date | 25th April 1917 | |
| R.R. 235 B To EFC. From Mr. Coverley. EFC15/T25.4.17. X.2369A - 7 RINGED PISTONS WITHOUT SKIRT SCRAPER (Note: the word SCRAPER is struck through) The above experiment has been fitted to 7C-A.{Mr Adams} and is now removed. R.H.C. | ||