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).
Test report on the failure and performance of Firths Silco Manganese and American leaf springs.
| Identifier | ExFiles\Box 52\2\ Scan150 | |
| Date | 30th September 1927 guessed | |
| contd :- -2- In conjunction with these tests we have tested a pair of Firths Silco Manganese springs of the same loading : these failed after running as follows :- O.S. spring (1150 lbs.) after 21 hrs. 5 mins. Top leaf broken between 1st. and 2nd. rebound clip. N.S. spring (1100 lbs.) after 36 hrs. 55 mins. Top leaf broken 9" from rear shackle. Also 3rd. 6th. 7th. and 8th. leaves from the top broken. The life of the American springs is very satisfactory as for the same weight of material they have 27% greater initial deflection. Hs {Lord Ernest Hives - Chair} /A.J.Lidsey. Hs {Lord Ernest Hives - Chair} /Rn. {Mr Robinson} | ||