| Year | 1922 |
| Date | 16-Feb |
| Volume | 46 |
| Issue | 1,086 |
| Page | 180 |
| Category | Radio Engineering |
| Part | 2 |
| Title | Wireless Receiving Circuits |
| Author | Captain H. de A.Donisthorpe |
| Notes | Valves, the simple valve rectifying circuit suitable for spark & telephony reception, "R" type valve, the reaction or rectro-action circuit suitable for C.W. spark & telephony reception, Marconi "Q" type valve, "R.M.R." or "Mushroom", Marconi "V24" type |