| Year | 1931 |
| Date | 19-Feb |
| Volume | 64 |
| Issue | 1,554 |
| Page | 186 |
| Category | Electrical |
| Part | 3 |
| Title | Simple Electrical Measurements |
| Author | A.H.A. |
| Notes | Measuring impedance ohms in an alternating circuit, relation between resistance reactance and impedance, vestor diagram of composite voltages acting in alternating circuit |