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).
Results of compound testing in Phantom II gearboxes.
| Identifier | ExFiles\Box 144\1\ scan0181 | |
| Date | 11th June 1930 | |
| COPY. X 967. X. 4481. X. 967. X. 7310. X. 7530. BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} From Mx.{John H Maddocks - Chief Proving Officer} Mx{John H Maddocks - Chief Proving Officer}8/T11.6.30. PHANTOM 11 GEAR BOXES. Further to my memo Mx{John H Maddocks - Chief Proving Officer}9/T30.5.30., we have run three Phantom Gear boxes with 50% of Whitmore's Compound. These boxes were run on this mixture through Unit and Dynamometer test - in every case the condition of the gears surface was excellent. In accordance with arrangements made with Hs.{Lord Ernest Hives - Chair} we shall now run three more boxes with a similar percentage of Price's Compound, and incidentally we are arranging to revert to Price's Compound for axle testing. Mx.{John H Maddocks - Chief Proving Officer} | ||