| Year | 1930 |
| Date | 29-May |
| Volume | 62 |
| Issue | 1,516 |
| Page | 515 |
| Category | Electronic |
| Part | 1 |
| Title | The Elimination of Batteries for Wireless Reception |
| Author | W.Greenwood |
| Notes | Three-wire system for D.C. mains, varying voltage of D.C. mains, receiver isolated from A.C. mains by transformer, necessity for smoothing rectified A.C., short circuiting of D.C. mains by earthing filaments |