| Year | 1915 |
| Date | 15-Apr |
| Volume | 32 |
| Issue | 729 |
| Page | 305 |
| Category | Optical |
| Part | |
| Title | Some Simple Types of Periscope |
| Author | H.S. |
| Notes | Illustrating laws of reflection, a simple periscope, showing how "ghosts" are formed by multiple reflection from a plate glass mirror, a reflecting prism, a prism periscope, combined periscope & telescope |