| Year | 1922 |
| Date | 02-Mar |
| Volume | 46 |
| Issue | 1,088 |
| Page | 223 |
| Category | Radio Engineering |
| Part | 3 |
| Title | Radio Receiving Circuits |
| Author | Captain H. de A.Donisthorpe |
| Notes | Combined crystal and thermionic valve circuit, low-frequency amplifier for note or low-frequency magnification of rectified signals |