| Year | 1955 |
| Date | 11-Aug |
| Volume | 113 |
| Issue | 2,829 |
| Page | 156 |
| Category | In the Workshop |
| Part | |
| Title | A Simple Chronograph |
| Author | Duplex |
| Notes | The construction, the recording gear, the pens, the electric circuit, operating the chronograph, wiring diagram and earthing connection |