| Year | 1907 |
| Date | 16-May |
| Volume | 16 |
| Issue | 316 |
| Page | 460 |
| Category | Electrical |
| Part | |
| Title | Wheatstone Bridge & Variable Resistance Box |
| Author | "Bridge" |
| Notes | Plan of box, dial board, lever for ratio arms, circuit breaking key, alternative lever design, standard terminal, alternative connecting methods |