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).
Telegram discussing the replacement and strengthening of Phantom pistons due to potential breakage.
| Identifier | WestWitteringFiles\T\2July1928-December1928\ Scan018 | |
| Date | 16th July 1928 | |
| Hives Roycar Derby Twenty piston assuming break as phantom consider present dangerous scrap and replace with strengthened as phantom namely larger sole close to strengthened web four bearings only cancel recess and scraper ring groove opposite and between webs are die castings treacherous through cracks | ||