| Year | 1997 |
| Date | 15-Aug |
| Volume | 179 |
| Issue | 4,048 |
| Page | 206 |
| Category | General |
| Part | |
| Title | A Hydrostatic Level |
| Author | Stephen Wessel |
| Notes | Describes a variation on the water tube manometer. How it all began, intractable, progress, crystal clear, application, accuracy |