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).
Use of SZ/NCR material for carbonized parts, referencing Bentley and B.V. gearbox components.
| Identifier | ExFiles\Box 99\4\ scan0235 | |
| Date | 11th December 1939 | |
| H 28 To Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} (Belper Baths). Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}13/MH.{M. Huckerby}11.12.39. SZ/NCR CARBONIZED PARTS. I have not been able to find any example where in a case of failure we merely altered the material to SZ/NCR. In a case of the Bentley differential which I mentioned on the telephone, we also altered the teeth from 8 to 7 DP. As you may know, from the 24th. B.V. gearbox onwards the layshaft cluster will be made in SZ/NCR, but we have not got a dynamometer figure of merit for the tooth strength. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||