| Year | 1917 |
| Date | 15-Mar |
| Volume | 36 |
| Issue | 829 |
| Page | 161 |
| Category | Electrical |
| Part | |
| Title | A Mechanical Rectifier |
| Author | E.T.Painton |
| Notes | General arrangement, moving arm & exciting coils, the connections, A.C. magnet, winding partly cut away to show bobbin, variable resistance, the essential parts, contact pillar, the back of the board |