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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).
On constant current generators, detailing the failure of fuses as a safeguard and suggesting an iron wire resistance as a more permanent solution.

Identifier  ExFiles\Box 61\2\  scan0275
Date  6th December 1919
  
R R.{Sir Henry Royce} 235 A (100 T) (S.F 846 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460
X.2515
December 6, 1919.

Oy-7-G6/12/19.

Bn{W.O. Bentley / Mr Barrington} from Oy:
Gs/R: EFC.

X.294. RE CONSTANT CURRENT GENERATORS X.2515 X.3449

1. A constant current generator, if run without the battery, is in danger of roasting the windings and I believe it has been usual to fit a fuse in the field windings to prevent this. I think this is done on the Lucas System.

2. It is found, however, in the United States where constant current generators of the third brush type are habitually used on the cheaper cars, that after the fuse has once been blown, it is often replaced by a piece of copper wire so that the original safeguard is destroyed.

3. In order to get a more permanent safeguard, a number of makers use an iron wire resistance instead of the fuse. Perhaps this might be of interest at a possible development of the Lucas scheme.

Oy
  
  


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