| Year | 2007 |
| Date | 08-Jun |
| Volume | 198 |
| Issue | 4,301 |
| Page | 703 |
| Category | General |
| Part | 102 |
| Title | Letters to a Grandson |
| Author | M.J.H. Ellis |
| Notes | Concludes his study of the career of Scottish inventor James Walter Robertson. Clarke's machine, connection of armatures |