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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
  
  


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