Alteration to the manufacturing process of Phantom III gearboxes, specifically using unlapped cones.
| Identifier | ExFiles\Box 94\2\ scan0211 | |
| Date | 20th April 1937 | |
| RHC. {R. H. Coverley - Production Engineer} from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} c. Mx. {John H Maddocks - Chief Proving Officer} c. By. {R.W. Bailey - Chief Engineer} 328 P.III GEARBOX. Rm {William Robotham - Chief Engineer} /Gry {Shadwell Grylls} 4/R.20.4.37. Replying to your memo RHCl/Cy/JWA.16.4.37., in view of the success of unlapped cones, we recommend that all future production boxes should be made in this manner. We do not think this necessitates a standardisation sheet as it is only an alteration to manufacture and not to design. Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} | ||
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).