| Year | 1931 |
| Date | 12-Nov |
| Volume | 65 |
| Issue | 1,592 |
| Page | 479 |
| Category | Electrical |
| Part | 9 |
| Title | Simple Electrical Measurements |
| Author | A.H.A. |
| Notes | Principle of induction type measuring instrument, shape of induction disc to even up scale divisions, dynamometer type of measuring instrument |