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 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.
  
  


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