| Year | 1933 |
| Date | 26-Jan |
| Volume | 68 |
| Issue | 1,655 |
| Page | 93 |
| Category | Queries and Replies |
| Part | |
| Title | 5002. Construction of 230 v. to 20 volt Transformer |
| Author | W.J.L. |
| Notes | Metal rectifiers arranged in "bridge" fashion, centre tapped transformer for metal rectifier, transformer for full-wave valve rectifier, dimensions of transformer core |