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 table of gearbox weights and costs for various car models, with related commentary.
| Identifier | ExFiles\Box 136\2\ scan0015 | |
| Date | 23th January 1939 | |
| -4- Rm{William Robotham - Chief Engineer}4/R.23.1.39. Box. Weight of Box. Cost of Box. Cost/Lb. Humber Snipe 93 £10/-/- 2.156/- Hillman Minx 55.5 £6/-/- 2.165/- Rover 74 £13/-/- 3.80/- B.50 x 82 £46/-/- 11.2/- Wraith x 90 £67/-/- 14.9/- Bentley II x 90½ £74/-/- 16.4/- x For this comparison, the servo and damper governor units have not been included in the boxes produced by R.R. Ltd. as they do not exist on those of other makes. With a £70 gearbox, the chance of ever being able to afford an overdrive in addition to 4 speeds, as suggested by Sales, would seem to be exceedingly remote. Rm.{William Robotham - Chief Engineer} | ||