| Year | 1915 |
| Date | 22-Apr |
| Volume | 32 |
| Issue | 730 |
| Page | 325 |
| Category | Electrical |
| Part | |
| Title | An Accumulator Battery with Mercury Switchboard |
| Author | E.T.Painton |
| Notes | View, plan, showing adaptability for a variety of combinations, switching arrangement for pressure or current reading, arrangement of the leads |