| Year | 1907 |
| Date | 21-Feb |
| Volume | 16 |
| Issue | 304 |
| Page | 181 |
| Category | Electrical |
| Part | |
| Title | Some Accurate Electrical Measuring Instruments |
| Author | V.W.Delves-Broughton |
| Notes | A Tangent Galvanometer. method of constructing a tangent scale, elevationsm plan, compass-box with scale, needle & pointer |