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).
On testing 20 HP rear axle pinions, comparing the wear performance of air-hardened steel versus C.H.N.S.
| Identifier | ExFiles\Box 49\2\ Scan181 | |
| Date | 4th December 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} X.4256 Hs{Lord Ernest Hives - Chair}3/T4.12.23. RE. 20 HP. REAR AXLE. X.4256. Reference R1/M.12.23. All the axle pinions so far that we have tested have been to the original dimensions as regards length of teeth and radii. The comparisons made have been with C.H.N.S. and air hardened steel, and thickness of tooth with coarse gear. The results so far show the air hardened steel to be better than C.H.N.S. for wear. Hs.{Lord Ernest Hives - Chair} | ||