| Year | 1994 |
| Date | 03-Jun |
| Volume | 172 |
| Issue | 3,970 |
| Page | 688 |
| Category | Optical |
| Part | 10 |
| Title | Biological Microscope and Vertical Illuminator |
| Author | H.A.Holland |
| Notes | Instructions for assembling and finishing. Distance piece, iris holder and lens holder, lamp tube, assembling the lamp tube, lamp holder, lamp holder body, nuts and pins, pin guide, assembly of the lamp holder, test run, finishing, 5/8" x 8tpi lh tap |