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).
Specifications and manufacturing methods for three different types of pistons.
| Identifier | ExFiles\Box 37\2\ scan 150 | |
| Date | 8th October 1917 | |
| R.R. 235a (200 T) (S.D. 408. 26-4-17.) Bm. 2/156/12. X.3183 8.10.17 To EFC. from AK. X.2822A/B - Special method of preventing disintegration of pistons by casting piston crown in the form of a spinning. X.3177 - Pistons with 93% aluminium & 7% copper. R.A.F. B.4 alloy without zinc & as tin. X.3183 - Pistons 93% aluminium, 7% copper & .5% magnesium. These are all cast and handed to Mr. Coverley. (Sgd) A.K. | ||