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).
Testing Ricardo pistons in aluminium and cast iron, comparing the Zephyr and Ricardo types.
| Identifier | ExFiles\Box 35\2\ scan 186 | |
| Date | 1st January 1920 | |
| Contd. -2- R6/G6.1.20. It might also be advisable to test a set of Ricardo pistons in both aluminium and cast iron, made in accordance with our most recent knowledge. I am inclined to think, however, that some form of collapsable piston in case of sudden or rapid expansion by heat is very desirable, and if this is so, the Zephyr type seems to be the least [word 'least' is struck through and 'most' is handwritten above] hopeful, leaving the trunk of Ricardo type with the treatment recently indicated, as being the most likely to give satisfaction. [Watermark: 1904] [Watermark: MADE AT CROXLEY R.{Sir Henry Royce}] [Footer: R.R. 255A.1100 T/Y (R/F) 816 6.8.19 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2160] | ||