| Year | 1930 |
| Date | 24-Jul |
| Volume | 63 |
| Issue | 1,524 |
| Page | 74 |
| Category | Optical |
| Part | |
| Title | An Optical Projector for Opaque Objects |
| Author | |
| Notes | Diagram of light path in an optical lantern, plan of lantern for opaque objects, lantern chimney with inverted canister, section of condenser |