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).
Diagrams comparing engine characteristics using Aluminium and Cast Iron pistons at various RPMs.
| Identifier | ExFiles\Box 174\2\ img252 | |
| Date | 11th May 1934 | |
| Top Row: 1300 1700 2600 3500 Ex 1736 ALUMINIUM PISTONS 11/5/34 4000RPM MOTORING THROTTLE CLOSED NO DAMPER Bottom Row: 1300 1700 2600 3500 Ex 1736 C.I. PISTONS 11/5/34 4000 RPM MOTORING THROTTLE CLOSED NO DAMPER | ||