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).
Blueprint illustrating three positions of a 20/25 Synchromesh sliding piece and related gear engagement issues.
| Identifier | ExFiles\Box 104\4\ scan0126 | |
| Date | 4th May 1932 guessed | |
| 20/25 SYNCHROMESH (1) TOP DRIVE (2) DRIVE 3RD (3) DRIVE IN 3RD DRIVE IN TOP 1. TOP GEAR COMES OUT OF MESH 2. 3RD GEAR COMES OUT OF MESH 3. NEITHER GEAR WORKS OUT TYPES OF TOP AND 3RD GEAR SLIDING PIECE IN EACH CASE SHEWN IN NEUTRAL POSITION | ||