| Year | 1923 |
| Date | 15-Nov |
| Volume | 49 |
| Issue | 1,177 |
| Page | 552 |
| Category | Radio Engineering |
| Part | 4 |
| Title | Wireless Circuits and their Development |
| Author | A.V.Ballhatchet |
| Notes | Resistance coupling, three-valve resistance amplifier, another three-valve resistance amplifier, resistance circuit with re-action, resistance coupling with capacity reaction, four-valve amplifier for frame aerials, a five-valve amplifier, amplifier for radio or audio frequency, an oscillation generator, crystal and heterodyne circuit, H.F. - crystal and heterodyne |