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).
Specifications for two new Phantom III wide feet gear boxes.
| Identifier | ExFiles\Box 94\2\ scan0057 | |
| Date | 5th November 1936 | |
| X328 RHC.{R. H. Coverley - Production Engineer} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Rm{William Robotham - Chief Engineer}7/GR.{George Ratcliffe}5.11.36. PHANTOM III GEAR BOXES. We understand you are building two more wide feet gear boxes. We should like these to incorporate:- 1st Box. R.R. gears. 10° cones throughout. Screw threaded oil scoop for third Motion Shaft. Ball bearings - E/Hdyl/HP.15.5.36. N. Sch. 4810. 2nd Box. Cadillac gears. 9° cones throughout. Screw threaded, otherwise as on production. Rm.{William Robotham - Chief Engineer} | ||