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).
Radiator thermometer contact failures being resolved by using 16 Volt bulbs.
| Identifier | ExFiles\Box 175\4\ img109 | |
| Date | 5th July 1928 | |
| X.3875. 5.7.28 RADIATOR THERMOMETERS. We have had not further contact failures since using 16 Volt bulbs. EFC. | ||