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 of an American spring and a Woodhead's spring.
| Identifier | ExFiles\Box 42\3\ Scan135 | |
| Date | 11th August 1921 | |
| R.R. 925A (100T) (S.H. 728. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 X3854 HS.{Lord Ernest Hives - Chair} H11/EB11.8.21. Laboratory. Re American Spring and Woodhead's x3900 Spring. Analysis. American. Woodhead's. 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 Woodhead's. The microscope confirms the finer grain of the American spring. H1. FC RECEIVED AUG 11 1921 | ||