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 detailing the results of fracture, bend, and chemical analysis tests on road spring plates.
| Identifier | ExFiles\Box 43\2\ Scan251 | |
| Date | 9th May 1928 | |
| H16/EA9.5.28. Laboratory. c to Hs.{Lord Ernest Hives - Chair} Re Road Spring Plates - Your Ref. BY/Cgh{W Clough}14/G.16.4.28. We give below the results of our Fracture, Bend and Brinell tests and also our analyses :- Lab. Reference Brinell No. Figure. Fracture. Type. Broken after: Hrs. Mins. 3 415 Fine grain { To T.F.&S design. 13 50 4 415 " } 13 10 9 415 " { American Made. 26 45 11 415 " } 26 45 12 415 " } 26 45 13 444 " } 26 45 1 401 Moderate. "Chinese" American. 8 16 10 415 " American made. 26 45 X 2 388 Coarse. { "Chinese"American, 9 46 5 375 " { Made to instructions 8 46 6 388 " { on American Sheets. 6 30 7 363 " { American Made, 20 55 8 375 " } 26 45 X. Rusted crack at point of fracture.(New fract.-not original). Note. "American made" --- Actually made in U.S.A. "Made to instructions on American sheets" --- Made by Thos.Firth & Son. "Chinese" American --- Exact copy of American springs made by Thos.Firth & Son. "T.F.&S." design. --- Thos.Firth & Sons' own design and make. Spring No. 1. 3. 5. 7. 9. 10. Carbon ----- 0.50% 0.51% 0.52% 0.46% 0.47% 0.47% Manganese --- 1.04% 1.05% 1.03% 0.84% 0.73% 0.72% Chromium --- Negligible in every case. Silicon --- 1.81% 1.83% 1.79% 1.90% 1.99% 1.95% Hl. Hte | ||