| Year | 1939 |
| Date | 02-Mar |
| Volume | 80 |
| Issue | 1,973 |
| Page | 259 |
| Category | Railway |
| Part | |
| Title | Electric Traction |
| Author | C.Baker |
| Notes | Certain circuits, control gear, various systems for D.C. supply. Typical schematic power diagram, master controllers, model electro-magnetic contactor, systems of control, electro-magnetic systems, control circuit of accelerating relay |