| Year | 1973 |
| Date | 05-Oct |
| Volume | 139 |
| Issue | 3,474 |
| Page | 961 |
| Category | Horology |
| Part | |
| Title | Quartz Crystal Clocks |
| Author | Dr. K.Smith |
| Notes | Power amplifier, the power supply, construction of board two, winding the coil, testing and setting up, concluding notes |