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).
Index page listing documents for double valve springs, tappet spring, and axle position layout.
| Identifier | ExFiles\Box 3\4\ 04-page163 | |
| Date | 12th January 1933 | |
| - 2 - E.1/HP.12.1.33. * LeC.3297 - Double Valve Springs & Tappet Spring. 3290 - Layout showing axle position. E.{Mr Elliott - Chief Engineer} | ||