| Year | 1956 |
| Date | 07-Jun |
| Volume | 114 |
| Issue | 2,872 |
| Page | 940 |
| Category | Photograhic |
| Part | |
| Title | Photographic enlarging and enlargers |
| Author | G.I.Lilley |
| Notes | Principles of construction. Condenser or diffuser? Calculations of enlargement, interchangeable lenses, the vertical column, the counterpoise weight, the baseboard, ensuring fine focusing, the lens panel, the negative carrier, focusing screen, the bellows |