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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).
Condition of Phantom II gearbox gears after dynamometer testing with and without Whitmores compound.

Identifier  ExFiles\Box 15\5\  Scan131
Date  30th May 1930
  
Hs.{Lord Ernest Hives - Chair} from Mx.{John H Maddocks - Chief Proving Officer}
X7 310.

Mx{John H Maddocks - Chief Proving Officer}9/T30.5.30
X7 310.

PHANTOM II GEAR BOX

Examination of condition of gears after Dynamometer invariably shows local plucking of the gear tooth surface, particularly on the second speed gear, see attached copy of memo to Sft.{Mr Swift}

Yesterday a chassis was run on the dynamometer with a percentage of Whitmores compound in the oil in the gear box - this was done inadvertently. The condition of the gears in this box after dynamometer test was remarkably good. In order to confirm that this was due to the presence of Whitmores compound, we are arranging to run three more gear boxes with a 50/50 mixture, and will report the results of this in due course.

If the results are favourable, we might consider, for strenuous dynamometer testing only, using a mixture. It is of course quite out of the question to use Whitmores compound, or anything similar, in gear boxes in service.
  
  


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