2019/022
Wild ZNL 16 Zenith and Nadir Plummet
c.1980
Wild ZNL 16 Zenith and Nadir Plummet. Used for vertical plumbing over longer distances.
Being detachable from the tribrach the ZNL (which has a plumbing accuracy of 1/30 000) can be centred over or under the required point and then replaced by the theodolite with guaranteed forced-centring. For some tasks, particularly those connected with large constructions, the ZNL can be used as an independent instrument. For engineers it is particularly useful when working on towers.
| Acquisition Number | 2019/022 |
|---|---|
| Item Type | |
| Short Description | Wild ZNL 16 Zenith and Nadir Plummet |
| Manufactured by | |
| Date of Manufacture | c. 1980 |
| Sub-items | Green wooden box |
| Supporting Items | None |
| Makers Number | 13382 |
| Marks | "WILD HEERBRUGG SWITZERLAND" |
| Dimensions (mm) | 160 (H) 245 (L). Weight 1.91 kg |
| Donor | University of Portsmouth, Faculty of Technology, School of Civil Engineering & Surveying |
| Date Donated | August 2019 |
| Materials | Metal |
| Condition | Good |
| Display Location |
