| Year | 1921 |
| Date | 17-Nov |
| Volume | 45 |
| Issue | 1,073 |
| Page | 428 |
| Category | Radio Engineering |
| Part | |
| Title | The Combination of the Crystal and Thermionic Triode |
| Author | Captain H. de A.Donisthorpe |
| Notes | Introduction, description, aerial with combination of crystal & thermionic triode, operation, double magnification circuit, explanation, conclusion |