| Year | 1933 |
| Date | 06-Jul |
| Volume | 69 |
| Issue | 1,678 |
| Page | 16 |
| Category | Electrical |
| Part | |
| Title | Photo-Electric Cells at the Science Museum |
| Author | |
| Notes | Automatic door opening, counting moving objects, measurement of smoke density, safety device, paper bag making, talking films |