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).
Comparison of gear ratios between a Lincoln and a Phantom III 31-EX vehicle.
| Identifier | ExFiles\Box 91\1\ scan0186 | |
| Date | 3rd January 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}12/KW.3.1.36. Gear Ratios. Lincoln Top 4.58 : 1 2nd 8.15 : 1 1st 13.35 : 1 Rev. 15.71 : 1 Ph.III 31-EX. Top 4.25 : 1 3rd 5.59 : 1 2nd 8.45 : 1 1st 12.74 : 1 Rev. 12.92 : 1 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||