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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).
Extract regarding American parts, specifically the Westinghouse generator, regulator, and starter motor for the 4-EX model.

Identifier  ExFiles\Box 23\2\  Scan084
Date  10th December 1930
  
R.R. 238M (100 T) (S.H. 798, 10-12-30) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 3948

X1086

Extract from Cyl/G3.6.21.

RE AMERICAN PARTS ON 4-EX. X.3966 X.4031 X.10E

(3) WESTINGHOUSE GENERATOR, REGULATOR AND STARTER MOTOR:

These machines are shipped with the car and may be readily interchanged with the Bijur output.

They have been improved from the original experimental sets fitted to the car during Mr. Hives' visit, in the way of cleaning up the internal insulation. The starter motor has been rewound to avoid the excessive current taken for starting a cold engine, noted by Mr.Hives on the original set.
  
  


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