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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).
Use of a resistor to adapt a 6-volt horn for a 12-volt system for a Mr. Bloom.

Identifier  ExFiles\Box 59\3\  Scan311
Date  31th January 1935
  
Hn.{F. C. Honeyman - Retail orders} From Hs{Lord Ernest Hives - Chair}/Wst.
Hs{Lord Ernest Hives - Chair}/Wst6/MA.31.1.35.

B.177-CW - Bloom.

The only thing we can do for Mr.Bloom is to fit a resistance in series with the horn to limit the current. We cannot recommend what value of resistance unless we either have the horn for test or are informed what its current consumption is at 6 volts.

In any case we should inform Mr.Bloom that even with a resistance the horn will not function so well on 12 volts as on 6.

Hs{Lord Ernest Hives - Chair}/Wst.
  
  


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