| Year | 1930 |
| Date | 26-Jun |
| Volume | 62 |
| Issue | 1,520 |
| Page | 611 |
| Category | Electrical |
| Part | 1 |
| Title | Electric Motor Installation and Management |
| Author | A.H.Avery |
| Notes | Resemblance between electric potential and water level, mechanical models representing electrical pressure, resistance and self-inductance, graphs of electrical conditions, different shapes of alternating current waves, single, 2 and 3 phase currents |