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).
Blueprint diagram of a Ricardo Patent cylinder head.
| Identifier | ExFiles\Box 21\2\ Scan085 | |
| Date | 19th March 1931 | |
| RICARDO PATENT CYL. HEAD. LARGE INLET VALVE SPARK PLUG IN CR{Mr Cra???ster / Mr Chichester} OF HEAD CLCE BETWEEN PISTON & HEAD ONLY THICKNESS OF GASKET SMALLER EXH VALVE STAMP: 19 MAR 31 DERBY | ||