| record number: | 63 |
| instrument type: | balloon theodolite |
| manufacturer: | Askania |
| serial number: | 369570 |
| model: | bxx. |
| weight: | 2.65 kg |
| dimensions (l/w/h): | 20/25/25 cm |
| year of manufacture: | 1942 |
| centering and leveling the instrument: |
plumb bob
toric level on the top of the instrument |
The bxx. theodolite was made in 1942. It was used to observe balloons, which is why it is also called a balloon theodolite. The instrument design is adapted for fast measurement of vertical angles with minute precision. The instrument has two telescopes. The smaller one, with 3x magnification, is used to find the balloon, while the larger main one, with 16x magnification, is used to fine aim at the balloon and take measurements.
The instrument is in the same condition as when it was originally taken out of service.
Characteristics
| horizontal circle | vertical circle | |
|---|---|---|
| diameter: | protected except for reading area, 12 cm | unprotected semicircle, 12 cm |
| type of division: | engraved division | engraved division |
| limb implementation: | metal bracket | metal bracket |
| division: | sexagesimal/sexadecimal | sexagesimal/sexadecimal |
| unit: | 1° | 1° |
| Reading | ||
| number of reading points: | 2 | 2 |
| reading device: | vernier | vernier |
| number of units: | 600 | 600 |
| graduation unit: | 6' | 6' |
| repetition: | no | / |
| Telescope | ||
| diameter of objective: | 40 mm, to search 13.5 mm | |
| magnification: | 16 x, to search 3 x | |
| type: | telescope with internal focusing | |
| cross hairs/reticule: | horizontal and vertical hairs | |