| Year | 1919 |
| Date | 24-Apr |
| Volume | 40 |
| Issue | 939 |
| Page | 301 |
| Category | Photographic |
| Part | |
| Title | Photographic Enlargers and How to Design Them |
| Author | R.Drilhon (Pau, France) |
| Notes | Diagrams relating to the optics of enlarging apparatus, No. 1 photographic enlarger, details of construction, the negative frames, showing construction of the smaller No. 2 enlarging apparatus, enlargement obtained from a vest pocket Kodak negative |