| Year | 2000 |
| Date | 07-Apr |
| Volume | 184 |
| Issue | 4,117 |
| Page | 430 |
| Category | Optical |
| Part | 6 |
| Title | An Optical Comparator for the Home Workshop |
| Author | Richard E.Butterick (Canada) |
| Notes | Final details of the co-ordinate micrometer stage. Slide return springs, spring winding, assembly |