| Year | 1912 |
| Date | 25-Apr |
| Volume | 26 |
| Issue | 574 |
| Page | 400 |
| Category | Electrical |
| Part | |
| Title | An Automatic Change-over Switch for Battery Lighting |
| Author | R.Thompson |
| Notes | Constructional & wiring details of automatic change-over switch for battery lighting, general view, diagram of connections, enlarged view of the switch |