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).
Chassis 2301, detailing the special double piston rings with a new locking device.
| Identifier | ExFiles\Box 16\1\ Scan125 | |
| Date | 22th April 1913 | |
| AW/S/15/L22413 X741 April 22nd. 1913 Report on Chassis 2301 PISTONS. X.293 The pistons on this engine are fitted with the special double rings which have Mr Royce's new locking device, in the shape of a small pip left on the inside of the outer ring. The drawing Nos. are :- Outer ring E.3189 Inner ring E.3190 | ||