| Year | 1950 |
| Date | 11-May |
| Volume | 102 |
| Issue | 2,555 |
| Page | 670 |
| Category | Cinematic |
| Part | |
| Title | Miniature Slide and Strip Projectors |
| Author | "Kinemette" |
| Notes | The condenser, conjugate focus, the objective system, faults in lenses, chromatic aberration, spherical aberration, curvilinear distortion |