Rolls-Royce Archives
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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).
Test report on ballast resistance with mileage readings over time.

Identifier  ExFiles\Box 168a\5\  img050
Date  3rd April 1929
  
X7720
ENGINE & CHASSIS-DATA SHEETS DEPT.
Date:- 3-4-29.
Ballast resistance of 1/2 value.

| Date on. | Location | Date off. | Remarks. | Miles Reading Start. | Miles Reading Finish. | Miles covered | Total Miles. |
|---|---|---|---|---|---|---|---|
| 3-4-29 | 14 G4 | | Fitted to 14G4 | 346 | 1335 | 989 | 989 |
| 17-4-29 | " | | | 1335 | 2061 | 726 | 1715 |
| 8-5-29 | " | | . | 2061 | 2394 | 333 | 2048 |
| 14-5-29 | " | | | 2394 | 5498 | 3104 | 5152 |
| 6-7-29 | " | | | 5498 | 7285 | 1787 | 6939 |
| 24-8-29 | " | | | 7285 | 9666 | 2381 | 9320 |
| 25-10-29 | " | | | 9666 | 11019 | 1353 | 10673 |
| 3-12-29 | " | | | 11019 | 13844 | 2825 | 13498 |
| 3-2-30 | " | | | 13844 | 31888 | 18044 | 31542 |
| 8-6-30 | " | | | 31888 | 33873 | 1985 | 33527 |
| 8-7-30 | " | | This test proves that the present standard coil will not overheat with a 10% lower value ballast resistance. | | | | |
  
  


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