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 comparing the chemical composition and grain structure of an American spring and a Woodhead's spring.
| Identifier | ExFiles\Box 43\2\ Scan034 | |
| Date | 11th August 1921 | |
| COPY X3900 Hs.{Lord Ernest Hives - Chair} Hll/EB11.8.21 Laboratory. X3900 Re American Spring and Woodhead's Spring. X2628 Analysis. American. Woodheads. Carbon .42 .55 Manganese .85 .40 Nickel nil nil Phosphorus .017 .032 Silicon 1.78 .85 Sulphur .015 .037 Chromium .12 .82 The silicon is exceptionally high on the American spring and it contains no chromium to speak of. The fracture of the American spring is better than Woodheads'. The microscope confirms the finer grain of the American spring. Hl. | ||