| Year | 1919 |
| Date | 17-Jul |
| Volume | 41 |
| Issue | 951 |
| Page | 49 |
| Category | Electrical |
| Part | |
| Title | A Lighting and Experimental Switchboard |
| Author | R.Drilhon (Paris) |
| Notes | General view, diagram of connections, showing alternative system of lamp control, diagram of pedal switch mounted on the floor, the fuse board, switchboard wooden frame, method of fixing lampholders |