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).
Sketch of the Bensport piston, indicating a breakage with a red line.
| Identifier | ExFiles\Box 82\1\ scan0045 | |
| Date | 18th March 1933 guessed | |
| xV53a S K E T C H O F T H E P I S T O N O F T H E B E N S P O R T Red line is the breakage SECRET | ||