| Year | 1923 |
| Date | 12-Jul |
| Volume | 49 |
| Issue | 1,159 |
| Page | 45 |
| Category | Radio Engineering |
| Part | |
| Title | A Compact Crystal Receiving Set for Experimenters |
| Author | Richard Twelvetrees |
| Notes | Panel, coil with loop tappings and plugged switch connections, base and panel supports, inductance coil, stud and plug for selective switches, honeycombe coil, switch arms, crystal detectors, test buzzer, wiring diagram, results obtained |