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).
Test record sheet logging the performance of a 1% value old standard ballast resistance.
| Identifier | ExFiles\Box 168a\5\ img049 | |
| Date | 3rd January 1929 | |
| X7720 ELECTRICAL DEPT. Ballast resistance of 1% value old standard. Date. 3-1-29. | Date on | Location | Date off | REMARKS | Miles reading START. | Miles reading FINISH. | Miles COVERED | Total ml. | |---|---|---|---|---|---|---|---| | 3-1-29 | Lab. | 4-1-29 | Received from Mr Wolstenholme. Tested OK. Fitted to 20 EX | 0002 | | | | | 4-1-29 | 20EX | | | | 1021 | 1019 | 1019 | | 15-2-29 | " | | | | 1922 | 901 | 1920 | | 18-3-29 | " | | | | 3064 | 1142 | 3062 | | 18-4-29 | " | | | | 3868 | 804 | 3866 | | 14-5-29 | " | | | | 4236 | 368 | 4234 | | 3-6-29 | " | | | | 5261 | 1025 | 5259 | | 6-7-29 | " | | | | 5355 | 094 | 5353 | | 24-8-29 | " | | | | 8844 | 3489 | 8842 | | 30-10-29 | " | | | | 9709 | 865 | 9707 | | 23-11-29 | " | | | | 11564 | 1855 | 11562 | | 4-2-30 | " | | | | 12090 | 526 | 12088 | | 17-3-30 | " | | | | 12675 | 585 | 12673 | | 5-5-30 | " | | | | 13509 | 834 | 13507 | | 3-6-30 | " | | | | 15753 | 2244 | 15751 | | 7-7-30 | " | | | | | | | | 11-8-30 | " | | | | 16967 | 1214 | 16965 | This test proves that the present standard coil will not overheat with a 10% lower value ballast resistance. | ||