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).
Composition of ballast resistance wire and a request to query suppliers for an improved alloy.

Identifier  ExFiles\Box 168a\5\  img004
Date  19th June 1926
  
To Wd.{Mr Wood/Mr Whitehead} from EFC.

X 8790
EFC1/T19.6.26.

RE BALLAST RESISTANCE WIRE. X 3716

The ballast resistance wire which we are at present receiving for production shows on analysis to be nearly pure nickel and only to contain 0.20% of iron. This is satisfactory if we specify pure nickel.

We have now, however, reason to believe that a small content manganese, about .3 to .4%, improves the ballast resistance properties of the material, and we are desirous of obtaining some nickel wire with approximately this content of manganese, but still with as low as possible a content of iron.

We should be pleased if you would put a query to our suppliers as to whether they could supply us with sufficient wire for, say, 1 dozen ballast resistances, alloyed with manganese in the manner referred to; standard diameter.

EFC.
  
  


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