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).
Manufacturing operations and setup for a 40 M/M barrel.
| Identifier | ExFiles\Box 176\3\ img072 | |
| Date | 21th October 1940 guessed | |
| 40 M/M BARREL 4 JAW CHUCK 5.000 DIA. -1/16 OPN 1 - DRILL 4 POINT RUNNING STEADY 3.000 DIA. -1/16 OP.N 1 DRILL 4 POINT ADAPTOR 2.875 DIA. -.5 OPN 4 - 1ST DRAW BORE. OPN 4 1ST DRAW BORE 4.325 DIA. -10 OP.N 10 | ||