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).
Summarizing the results of comparative tests on model cranks made from different materials.
| Identifier | ExFiles\Box 63\4\ scan0120 | |
| Date | 14th August 1930 | |
| X4499 To Rg.{Mr Rowledge} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}1/AD14.8.30. Further to Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/MJ19.5.30. We have now completed the following comparative tests on Model Cranks of various materials. From the results it will be seen that the high brinell S/ZNCR. and the VNCA. appear to give a result that is well up to the standard material, the VNCA. especially being very consistent. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||