| Year | 2008 |
| Date | 06-Jun |
| Volume | 200 |
| Issue | 4,327 |
| Page | 684 |
| Category | General |
| Part | |
| Title | Letters to a Grandson |
| Author | M.J.H. Ellis |
| Notes | Describes alternative ways of machining. Electron beam machining, ion beam machining, electrical discharge machining (spark erosion) |