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).
Specification for a special ballast resistance unit, detailing wire type, length and resistance value.

Identifier  ExFiles\Box 168a\5\  img025
Date  6th November 1928
  
x7720
6.11.28.

RE SPECIAL BALLAST RESISTANCE 1 1/4 INSTEAD OF DOUBLE VALUE.

Upon measurement in the lab. we find that using 32 S.W.G. nickel wire 33.5" would be required. This has been notified to RD.

EFC/HEW.

Resistance at 18°C of the above unit = 1.35 ohms.
  
  


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