| Year | 1914 |
| Date | 05-Feb |
| Volume | 30 |
| Issue | 667 |
| Page | 129 |
| Category | Electronic |
| Part | |
| Title | Notes on Wireless |
| Author | W.S.Farren |
| Notes | Details of crystal detector, details of change-over switch, diagram of connections of change-over switch, & with double adjustment potentiometer, connections for experimenting with various detectors, constructional details of switches |