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 analysis report on a fractured road spring.
| Identifier | ExFiles\Box 76\3\ scan0099 | |
| Date | 16th April 1919 | |
| E.R. 294 a (10m T)D.C.P. 575. 16-4-19. C1. 2354. BY.{R.W. Bailey - Chief Engineer} c to EH. H16/EB8819. Laboratory. RE FRACTURED ROAD SPRING. Analysis. Carbon .72 Manganese .42 Chromium .57 Phosphorus .037 Silicon .50 (approx). The Brinell hardness was found to vary considerably on opposite sides of the leaf; thus close to the point of fracture it was 404 on one side and 477 on the other. The Brinell hardness fell off rapidly towards the end. The fracture was very crystalline as one might expect from the high carbon in the material; it was also irregular as if the hardening had not been satisfactory. [Handwritten signature] | ||