| Year | 1925 |
| Date | 03-Sep |
| Volume | 53 |
| Issue | 1,271 |
| Page | 298 |
| Category | Industrial Electrics |
| Part | 1 |
| Title | The Possibilities of Electrical Switching |
| Author | J.C.H. |
| Notes | Single-way, two-way (with strap), two-way off, wiring diagrams showing various method of switching, series-parallel - off, "twinob", intermediate, bell circuit giving seven combinations with three bells, application of special switches for various lights, diagrams showing the functioning of various type of special duty switches, diagrams of Lundberg special duty switches |