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).
Page 3 of a report comparing the weight and durability of Dural versus steel nuts.
| Identifier | ExFiles\Box 31\5\ Scan269 | |
| Date | 10th December 1934 guessed | |
| -3- removed and tightened a considerable number of times without damage to either threads or hexagons. 12 Dural nuts weigh 13.4 grams. 12 steel nuts weigh 46.6 grams. Hs{Lord Ernest Hives - Chair}/G.H.Farmer. | ||