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 message from Royce about increased metal in the head and valve angles.
| Identifier | ExFiles\Box 48\4\ Scan082 | |
| Date | 9th July 1918 | |
| ROLLS-ROYCE, LIMITED. TELEGRAM RECEIVED BY TELEPHONE. from 2 increased metal in head and thirty or forty-five degree valve fact Per post letter follows FROM Royce RECEIVED | ||