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).
Agreement to test a well-tapered valve spring against a parallel one.
| Identifier | ExFiles\Box 56\2\ Scan074 | |
| Date | 25th March 1929 | |
| Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} X290 R9/M25.3.29. VALVE SPRINGS. X. 290 X. 7060 Though we are in a good position as regards these on all our work we have agreed that it would be worth while to make a well tapered spring of exactly the same mean characteristics, and test by examination (while running) and life if these are definitely superior to parallel ones over a wide range of speeds, for periodic vibrations. R.{Sir Henry Royce} | ||