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).
Cost analysis document comparing prices per pound for four different manufactured parts.
| Identifier | ExFiles\Box 97\2\ scan0230 | |
| Date | 1st December 1942 guessed | |
| D16950 33.360/- 1.278/- per lb. 13.968/- .394/- per lb. 41.904/- 1.181/- per lb. 101.232/- 2.853/- per lb. D16951 33.952/- 1.278/- per lb. 9.336/- .351/- per lb. 28.008/- 1.055/- per lb. 71.296/- 2.684/- per lb. D3400 26.949/- 1.278/- per lb. 5.560/- .264/- per lb. 16.680/- .791/- per lb. 49.189/3 2.333/- per lb. D7719 24.712/- 1.278/- per lb. 10.296/- .533/- per lb. 30.888/- 1.599/- per lb. 65.896/- 3.408/- per lb. Average cost per lb. 1.278/- .342/- 1.026/- 2.786/- | ||