| Year | 1907 |
| Date | 20-Jun |
| Volume | 16 |
| Issue | 321 |
| Page | 585 |
| Category | Electrical |
| Part | |
| Title | Some Accurate Electrical Measuring Instruments |
| Author | V.W.Delves-Broughton |
| Notes | Volt- and Ampere-Meters. With stopped action * independent zero point, section, spring & core for Ayrton-Perry solenoid instrument |