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).
Blueprint detailing the machining operations for a 40mm barrel.
| Identifier | ExFiles\Box 175\3\ img232 | |
| Date | 21th October 1940 guessed | |
| 40 M/M BARREL 4 JAW CHUCK 5.000 DIA. -1/16 OP N. 1 - DRILL. 4 POINT RUNNING STEADY 3.000 DIA. -1/16 OP N. 1 DRILL 4 POINT ADAPTOR 2.875 DIA. -5 OP N. 4 - 1ST DRAW BORE. 4 POINT RUNNING STEADY 5.000 DIA. -1/16 OP N. 4 1ST DRAW BORE 4 POINT ADAPTOR 2.875 DIA. -5 4 POINT RUNNING STEADY 4.325 DIA. -10 OP N. 10 | ||