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 showing a casting design and gear ratio arrangement for an indirect higher top gear.
| Identifier | ExFiles\Box 94\2\ scan0087 | |
| Date | 26th November 1936 guessed | |
| MACHINE CASTING HERE 27T 32 T 1ST MOTION SHAFT 3RD MOTION SHAFT 2ND MOTION SHAFT ARRANGEMENT OF GEAR RATIOS 32 C.M. 27 3RD 30 31 1ST 34 14 2ND 39 25 INDIRECT HIGHER TOP GEAR - PIII Rm{William Robotham - Chief Engineer} 261 | ||