| Year | 1919 |
| Date | 26-Jun |
| Volume | 40 |
| Issue | 948 |
| Page | 512 |
| Category | Railway |
| Part | |
| Title | Electric Railways: Alternating and Direct Current Systems Explained |
| Author | "Calculus" |
| Notes | The single-phase system, single-phase railway with single-phase high tension transmission, static transformer sub-stations, Ward Leonard system using a motor generator on the train, single-phase series motor, phase converter, the split-phase system |