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).
Road spring tests in France, comparing different makes and stiffnesses.
| Identifier | ExFiles\Box 72\3\ scan0167 | |
| Date | 1st October 1924 | |
| To CJ. } FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} } c. to BJ. BY.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} x9410 RL/M9.10.24. RE. ROAD SPRINGS - TESTS IN FRANCE. X. 9941 X. 9410 X. 2628 It seems as though our dynamometer bump test will give us the relative value of one make of spring over another, therefore the tests in France should be of the different design and proportion, rather than the different make, so that all springs should be the same make and design and only vary in stiffness i.e. :- One car 12½% stiffer than old springs. The other 20% " " " I think Woodheads seem the more consistent, and therefore this make would be better for road test. The other make (Firths) should be brought in line, and proved equal on the bumping rig. MADE AT CROXLEY R.{Sir Henry Royce} | ||