| Year | 1930 |
| Date | 15-May |
| Volume | 62 |
| Issue | 1,514 |
| Page | 465 |
| Category | Electrical |
| Part | |
| Title | Building Up a 250-watt Double-current Generator or Rotary Transformer |
| Author | A.H.Avery |
| Notes | Winding notes, former wound armature coils, partly completed armature, connections, assembly, electrical tests |