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).
Production programme table for B.U.S.M. detailing monthly and cumulative gun output.
| Identifier | ExFiles\Box 176\3\ img067 | |
| Date | 16th October 1940 guessed | |
| COPY FOR HPS.{Horace Percy Smith - Experimental Factory Mgr} B.U.S.M. PRODUCTION PROGRAMME. Total No. of Cumulative sets per month. total guns. Delivered up to Sept: 1st. 4 4 Period until the end of the year covering the production of 50 sets by toolroom methods. During September. 8 12 " October. 12 24 BUSM. cannot start making tools for 12 weeks i.e. end of Nov: due to other commitments. " November. 12 36 " December. 12 48 " January. 1941. 12 60 Start of 500 order, subject to mat'l being made available as required. Continuing by toolroom methods until tools become available at end of Feb:Delivery of tools will of course be a gradual process. " February. 12 72 " March. 25 97 " April. 40 137 Max: production rate of 10 guns per week - subject to provision of machine tools by the beginning of Dec: Completing 500 guns by the end of Jan: 1942. (17 months from present date.) " May and onwards 40 177 i.e. 10 per week --- oOo --- | ||