| record number: | 66 |
| instrument type: | theodolite |
| manufacturer: | Carl Zeiss Jena |
| serial number: | 1003587 |
| model: | Theo 080A |
| weight: | 1.90 kg |
| dimensions (l/w/h): | 19/14/23 cm |
| year of manufacture: | 1979 |
| centering and leveling the instrument: |
plumb bob
toric level on the alidade compensator |
The theodolite was made in 1979. Although small, its functionality is comparable to the larger, more complex Zeiss theodolites of the time. The positioning of the levels, compensator, the line microscope, repetition device and Reichenbach crosshairs simplify the measurement process. Measurement precision is lower compared to more complex instruments. The measurement resolution by evaluating a part of the graduation unit of the division is 30''.
The exhibit has two additional attachments - a tube mounted on the telescope to protect it from stray light, and an attachment for observing steep lines of sight. A compass can also be added.
The theodolite was used for teaching purposes for simple polar measurements and staking out. It is in the same condition as when it was originally taken out of service.
| horizontal circle | vertical circle | |
|---|---|---|
| diameter: | protected, 61 mm | protected, 61 mm |
| type of division: | engraved division | engraved division |
| limb implementation: | glass bracket | glass bracket |
| division: | sexagesimal/sexadecimal | sexagesimal/sexadecimal |
| Reading | ||
| number of reading points: | 1 | 1 |
| reading device: | line microscope | line microscope |
| number of units: | / | / |
| graduation unit: | 5', estimation 30'' | 5', estimation 30'' |
| repetition: | Mahler membrane | |
| Telescope | ||
| diameter of objective: | 32 mm | |
| magnification: | 18 x | |
| type: | telescope with internal focusing | |
| cross hairs/reticule: | Reichenbach's crosshairs, constant 100 | |