| Year | 1921 |
| Date | 29-Dec |
| Volume | 45 |
| Issue | 1,079 |
| Page | 566 |
| Category | Electrical |
| Part | 7 |
| Title | Rectifying Devices |
| Author | E.T.Painton |
| Notes | A Practical Article describing the Construction and Operation of Devices for Transforming Alternating Currents into Direct Currents. Characteristics and Applications of Rectified Currents. Charging a small battery, variable choking coil |