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).
Laboratory report on the average case depth of an inner race from a Phantom II steering system after mileage.
| Identifier | ExFiles\Box 95\1\ scan0478 | |
| Date | 21th March 1938 | |
| 350. Rm.{William Robotham - Chief Engineer} from H1/EJW. H1/EJW.3/GS.21.3.38. LABORATORY. PHANTOM II STEERING. AH Your Ref: Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}3/MH.{M. Huckerby}18.3.38. Average depth of case on inner race F.87130 removed from chassis 3.BU.168 after 8,966 miles, is approximately .030" on the track. H1/EJW Race returned herewith. | ||