Modification to the Wraith gear box sliding piece for top and 3rd speed to prevent disengagement on over-run.
| Identifier | ExFiles\Box 8\11\ 11-page112 | |
| Date | 25th January 1938 | |
| NY/MS. c. Rm. {William Robotham - Chief Engineer} a. {Mr Adams} De/Hdy. {William Hardy} 628 DA. {Bernard Day - Chassis Design} 8/G.25.1.38 DAH FH CAEH WRAITH GEAR BOX. Herewith is FD. {Frank Dodd - Bodies} 101 shewing the sliding piece for top and 3rd speed, modified to provide the concertina form to prevent the 3rd speed working out of mesh on over-run. The outer member has the plunger groove shifted in position, but existing pieces can be used. DA. {Bernard Day - Chassis Design} | ||
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).