| Year | 1919 |
| Date | 25-Sep |
| Volume | 41 |
| Issue | 961 |
| Page | 294 |
| Category | Electronic |
| Part | |
| Title | Wireless Notes and Developments |
| Author | J.Scott-Taggart |
| Notes | The Vacuum Valve. Cascade amplification, a two-valve wireless receiver using an apeirodic coil as coupling, with tuned intermediary circuits |