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 performance and failure of dynamo sentinel components over various distances.
| Identifier | ExFiles\Box 165\6\ img160 | |
| Date | 29th June 1920 | |
| RR 238 (150 wks) (SH57.29-6-20.) MP 22435B ROLLS-ROYCE LTD. INSTRUCTIONS. To _________ Order No. _________ Customer's No. 2 Both an 87° and a 97° centinel was put on dynamo 1357 which was fitted with a 28 slot armature and ran 11703 miles in France on 10 G III. On the return of the car both centinels were found melted. It is not known after what distance this occurred; the output of the machine had been set about one ampere higher than standard. Com. solder remained O.K. An 87° centinel was fitted to dynamo 1357, a standard machine on 11 G III. This was found melted after 1272 miles and a 97° fitted. This remained OK for a further 8037 miles when the dynamo was replaced by N° 161, fitted with EG 3417 brushes. After 2457 (cont-d) Signed _________ This Sheet must be filed on completion of the work. | ||