| record number: | 36 |
| instrument type: | theodolite |
| manufacturer: | Carl Zeiss Jena |
| serial number: | 116256 |
| model: | Theo 030 |
| weight: | 3.96 kg |
| dimensions (l/w/h): | 20/14/28 cm |
| year of manufacture: | 1950 |
| centering and leveling the instrument: |
plumb bob
circular level toric level on the alidade, centrally set vertical circle level |
The minute-order theodolite was made in 1950. The classic Zeiss design of pre-World War II models is upgraded. The coincidence vertical circle level, the microscope for reading the division, placed next to the eyepiece of the telescope, the repetition device based on a Mahler membrane and the compass attachment further simplify and shorten the measuring process. The instrument still does not have an optical plummet; it is centred with an ordinary plummet. The division graduation unit of the line microscope is 1'.
The instrument was used for teaching work until the end of the 1990s, mainly for polar detail measurements and the measurement of simple polygon nets. In 2016, the instrument was cleaned and the microscope tube was partially re-lacquered.
| horizontal circle | vertical circle | |
|---|---|---|
| diameter: | protected, 94 mm | protected, 74 mm |
| type of division: | engraved division | engraved division |
| limb implementation: | glass bracket | glass bracket |
| division: | sexagesimal/sexadecimal | sexagesimal/sexadecimal |
| unit: | 1° | 1° |
| Reading | ||
| number of reading points: | 1 | 1 |
| reading device: | scale microscope | scale microscope |
| number of units: | 60 | 60 |
| graduation unit: | 1' | 1' |
| repetition: | Mahler membrane | / |
| Telescope | ||
| diameter of objective: | 35 mm | |
| magnification: | 25 x | |
| type: | telescope with internal focusing | |
| cross hairs/reticule: | Reichenbach's crosshairs, constant 100 | |