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 diagram illustrating the operation of the 20/25 synchromesh system for top and 3rd gear.
| Identifier | ExFiles\Box 178\4\ img060 | |
| Date | 7th March 1932 guessed | |
| 20/25 SYNCHROMESH (1) TOP 3RD DRIVE (2) DRIVE (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 | ||