| Year | 1932 |
| Date | 08-Sep |
| Volume | 67 |
| Issue | 1,635 |
| Page | 227 |
| Category | Electrical |
| Part | |
| Title | How to make a Selenium Cell |
| Author | Edgar T.Painton |
| Notes | Elements, section through coiled strips, completed cell, simple electric baking oven, details of relay, construction, test results |