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).
The melting temperatures of sentinels on various vehicle components and chassis.
| Identifier | ExFiles\Box 52\3\ Scan156 | |
| Date | 5th December 1923 | |
| X4430 5.12.23. X.4430 X.4596. X.4383. TEMPERATURE SENTINELS. A 73° condenser sentinel has melted once on 4GII. 82°C coil sentinels have melted, once on 3GII, 4GII and 6GII, and twice on 7GII, and have been replaced by 87° sentinels. 87°C coil sentinels - two melted on 3GII. 87°C dynamo sentinels have not melted on any chassis. Thus it appears that (1) The max. condenser temp. is about 70°C (2) " " coil " " " 87°C (3) " " dynamo " " " 85°C. EFC. {E. Fowler Clarke - Electrical Engineer} | ||