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).
Specifying the required poundage for the front springs on model 12-EX.
| Identifier | ExFiles\Box 67a\2\ scan0064 | |
| Date | 1st December 1927 | |
| To BY/HEB.{H. Biraben} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X 8410 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG2.12.27. The poundage for the front springs required for 12-EX is 1050 . Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||