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).
Log sheet tracking tests on a half-value old standard ballast resistance.
| Identifier | ExFiles\Box 168a\5\ img048 | |
| Date | 3rd January 1929 | |
| X7720 ELECTRICAL DEPT. Ballast resistance of 1/2 value old standard Date on, Location, Date off, REMARKS, Miles Machine start, Miles Machine finish, Miles cover, Total miles 3-1-29, lab., 4-1-29, Received from m/s Waterhouse. Tested OK. Fitted to 9EX., 8119 4-1-29, 9EX 15-2-29, ", 8486, 367, 367 18-3-29, ", 8614, 128, 495 17-4-29, ", 8980, 366, 861 14-5-29, ", 9926, 946, 1807 4-6-29, ", 0641, 715, 2522 8-7-29, ", 1883, 1242, 3764 28-10-29, ", 6538, 4655, 8419 2-12-29, ", 7942, 1404, 9823 17-3-30, ", 9455, 1513, 11,336 3-6-30, ", 1203, 1748, 13,084 5-7-30, ", 2744, 1541, 14,625 14-8-30, ", 5889, 3145, 17,770 This test proves that the present standard coil will not overheat with a 10% lower value ballast resistance | ||