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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 table for different grades of brushes, detailing their physical and electrical properties.

Identifier  ExFiles\Box 60\1\  Scan192
Date  11th February 1930 guessed
  
e2-

Grade of Brush
Spec.Res. ohms per In. cube
Coeff. of Friction
Contact at normal current density
Approx. max. commutator speed. Ft. per min.
Normal current density ampere

Morganite Link 5. .00075 .10 .90 10,000 60
Hard Morganite. Link HM{Capt. W. Hallam - Head Repairs}5. .00065 .11 .90 10,000 65
Electro-Graphitic EGO. .00070 .19 .95 5,000 65
EG.6630 .00130 .14 1.20 6,000 60
E.G.2. .00100 .22 .90 4,000 55.

In the case of the 20 HP. dynamo none of the four experimental grades above, suitable for the standard machine, are available.

CAP.
  
  


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