| Year | 1951 |
| Date | 26-Apr |
| Volume | 104 |
| Issue | 2,605 |
| Page | 542 |
| Category | Electrical |
| Part | |
| Title | An Electrical Test Instrument |
| Author | J.Stebbings |
| Notes | Circuit diagram with socket connections, potentiometer for subdivision of volt-meter scale, underside of meter board, the completed instrument |