| Year | 1994 |
| Date | 04-Feb |
| Volume | 172 |
| Issue | 3,962 |
| Page | 148 |
| Category | Optical |
| Part | 6 |
| Title | Biological Microscope and Vertical Illuminator |
| Author | H.A.Holland |
| Notes | Explains construction of the main tube. Racks and pinions, drawtube, drawtube guide, tube end cap, drawtube stop, finishing the stage, pictures on page 131 |