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).
Comparing the cost and features of various 4-speed gearboxes, including the B.50, Wraith, Snipe, and Mina boxes.
| Identifier | ExFiles\Box 148\2\ scan0109 | |
| Date | 19th January 1939 | |
| -2- The price of two 4-speed gearboxes, both of which weigh more than that of the B.50, has recently been investigated, and the cost of one of these, quoted in RHC. {R. H. Coverley - Production Engineer} £ , the other being slightly more. Therefore, even excepting the additional features of our box, such as the servo and governor unit, the B.50 box is disproportionately costly. Briefly, we would ask that all facilities available for producing quiet gears for the Wraith box should be available for the B.50 box. At the present moment, Wraith gears can be run together before they are assembled, but no such rig is available for the B.50. Rm. {William Robotham - Chief Engineer} [Handwritten] R.H.C. / Warburton Brown Snipe Box 93 lbs Cost £10. Cost / lb. 2.156/- Mina Box 55.5 lbs 750/week Cost. £6. Cost/lb. 2.165/- | ||