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 experimental front springs and frame durability, concluding that heat treatment was the reason for a longer life.
| Identifier | ExFiles\Box 119\2\ scan0007 | |
| Date | 1st May 1914 guessed | |
| Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}3/L26913. Sheet.2 A pair of experimental front springs made by Cocker, Sheffield, were used during the above test. This frame has lasted longer than the previous ones tested of this type, the previous ones lasting 210 minutes and 120 minutes respectively. These two frames were not heat treated and I think the longer life of the frame just tested is due to the heat treatment and not to the swivelling cross member. | ||