| Year | 1923 |
| Date | 27-Sep |
| Volume | 49 |
| Issue | 1,170 |
| Page | 355 |
| Category | Radio Engineering |
| Part | 2 |
| Title | Wireless Circuits and their Development |
| Author | A.V.Ballhatchet |
| Notes | Valve circuits, control of the grid potential, grid condenser and leak, grid cells, potentiometer control, functions of a valve, the valve as a rectifying detector, as a low frequency amplifier, L.F. amplifier circuits, separate filament control, crystal-valve circuits, high frequency amplification, tuned anode circuits, high frequency transformers, Round's no. 16 circuit, a double magnification circuit, another H.F. circuit, another H.F. and crystal circuit, a H.F. crystal L.F. circuit |