| Year | 1955 |
| Date | 17-Nov |
| Volume | 113 |
| Issue | 2,843 |
| Page | 722 |
| Category | Electrical |
| Part | |
| Title | Direct Current for the Workshop |
| Author | L.C.Longley |
| Notes | Surplus electric motors. Principle of A.C. voltage flow, introducing a rectifier, selenium stack, constructional details, stacking discs in parallel, voltmeter surprise, do it yourself, full-wave bridge circuit, voltage doubler |