| Year | 1923 |
| Date | 06-Sep |
| Volume | 49 |
| Issue | 1,167 |
| Page | 271 |
| Category | Radio Engineering |
| Part | 1 |
| Title | Wireless Circuits and their Development |
| Author | A.V.Ballhatchet |
| Notes | Various circuit descriptions, an oscillatory circuit, the crystal detector, series-parallel switches |