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).
Letter from Wellworthy Piston Rings Ltd. concerning the analysis of magnesium content in a supplied material.
| Identifier | ExFiles\Box 115\5\ scan0122 | |
| Date | 21th September 1938 guessed | |
| Agents Copy A.26 10 .895% A.27 12 .905% A.28 15 .95% You will see from the above that we are within approximately .05% of your findings and your suggestion that the magnesium content should be raised possibly 1 to 1.1% on virgin material as supplied by you will be very necessary in future. Yours faithfully, For WELLWORTHY PISTON RINGS LTD., Technical Manager. (Copy to Rolls Royce) | ||