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).
Investigation into why some cylinder heads cracked, attributing the cause to the material or its condition.
| Identifier | WestWitteringFiles\I\June1922\ Scan15 | |
| Date | 13th June 1922 | |
| Contd. -2- HMB/T13.6.22. So far the investigations appear to show that it is the material, or condition of the material, which is most likely to be the reason why some cylinder heads have cracked so readily, whereas others under the most severe conditions have stood up. HL. will be sending a report on the experience with semi-steel. He. | ||