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).
Melted coil sentinel (73°) fitted to a 4-GII.
| Identifier | ExFiles\Box 45\4\ Scan187 | |
| Date | 16th August 1923 | |
| X4079 16.8.23. Re COIL SENTINEL (73°) The above coil sentinel fitted to 4-GII has melted. The condenser sentinel is still O.K. (Coil in engine position). EFC/CAP. | ||