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).
Results of an Axle Bumping Test, comparing spring and hump periodicity.
| Identifier | ExFiles\Box 49\4\ Scan007 | |
| Date | 12th December 1913 | |
| C O P Y. COPY. Wor.{Arthur Wormald - General Works Manager} for Hy.{Tom Haldenby - Plant Engineer} from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} R3/P 12.12.13. Axle Bumping Test. With reference to the speed at which you are testing the front axle, if you remember, the periodicity of our springs is about 100 and your humps are run at about 100. Most of the front springs are faster; each periodicity being alike may cause our car to suffer more than would be the case with some other periodicity. Many thanks for your excellent reports we seem to be getting at something good. F.H.R. X23 | ||