| record number: | 59 |
| instrument type: | theodolite with laser tube |
| manufacturer: | MOM |
| serial number: | 243410 |
| model: | Li-Te-B23/360, Li-T1 |
| weight: | 5.22 kg |
| dimensions (l/w/h): | 16/18/28 cm |
| year of manufacture: | 1965 |
| centering and leveling the instrument: |
optical plummet
circular level toric level on the alidade coincidence vertical circle level |
The second-order theodolite was made in 1965. The theodolite is one of the most precise theodolites ever made in the MOM factory. The reading method is similar to the Zeiss system typical of second-order theodolites. By coinciding the diametral parts of the division, a part of the graduation unit of the division is determined and the second resolution of the reading on the circles is ensured.
The special feature of the theodolite is that a laser tube of a He-Ne Li-T1 laser can be added to the theodolite. A special attachment is used to direct the laser beam through the telescope. As the beam coincides with the line-of-sight axis, we can see the line-of-sight axis, which allows us measuring in the dark. This is particularly useful for staking out.
The instrument was used extensively in classic surveying exercises. The theodolite is still in excellent condition.
| horizontal circle | vertical circle | |
|---|---|---|
| diameter: | protected, 93 mm | protected, 60 mm |
| type of division: | engraved division | engraved division |
| limb implementation: | glass bracket | glass bracket |
| division: | sexagesimal/sexadecimal | sexagesimal/sexadecimal |
| unit: | 10' | 10' |
| Reading | ||
| number of reading points: | 1 | 1 |
| reading device: | coincidence micrometer | coincidence micrometer |
| number of units: | 600 | 600 |
| graduation unit: | 1'' | 1'' |
| repetition: | screw | / |
| Telescope | ||
| diameter of objective: | 45 mm | |
| magnification: | 30 x | |
| type: | telescope with internal focusing | |
| cross hairs/reticule: | Reichenbach's crosshairs, constant 100 | |