| Year | 1930 |
| Date | 05-Jun |
| Volume | 62 |
| Issue | 1,517 |
| Page | 539 |
| Category | Electronic |
| Part | 2 |
| Title | The Elimination of Batteries for Wireless Reception |
| Author | W.Greenwood |
| Notes | Supply from D.C. Mains. Typical smoothing circuit, potentiometer method of obtaining several voltages, alternative method, preventing mains being short circuited and loudspeaker leads being at high potential, filaments in series, grid bias |