| record number: | 20 |
| instrument type: | theodolite |
| manufacturer: | Starke & Kammerer Wien |
| serial number: | 10111 |
| weight: | 5.57 kg |
| dimensions (l/w/h): | 27/22/30 cm |
| year of manufacture: | 1895 |
| centering and leveling the instrument: |
plumb bob
two perpendicular toric levels on the alidade vertical circle: vertical circle level, tilting screw precise reversible levelling toric level on the telescope |
The theodolite was made around 1900. A reversible levelling toric level attached to the telescope allows precise levelling – the instrument was originally called “level-theodolite”. All three models of theodolites made by Starke & Kammerer at the turn of the century are described in an interesting way in the Encyclopaedia of Railway Engineering. This theodolite model is the most complex of the three. It differs from the simple model mainly in the precision with which it reads divisions of the horizontal circle. With scale microscopes, it is possible to assess one-third of the vernier interval, whereas the resolution is increased by a factor of three.
The instrument was completely restored in 2016 and is very well preserved. The clamp of the horizontal circle clamping screw is new.
| horizontal circle | vertical circle | |
|---|---|---|
| diameter: | protected, 15 cm | unprotected, 12 cm |
| type of division: | engraved division | engraved division |
| limb implementation: | silvered metal bracket | silvered metal bracket |
| division: | sexagesimal/sexadecimal | sexagesimal/sexadecimal |
| unit: | 10' | 10' |
| Reading | ||
| number of reading points: | 2 | 2 |
| reading device: | scale microscope | vernier |
| number of units: | 10 | 30 |
| graduation unit: | 1', estimation 0.1' (6'') | 20' |
| repetition: | clamping and micrometer screw | / |
| Telescope | ||
| diameter of objective: | 34 mm | |
| magnification: | 35 x | |
| type: | Ramsden's retractable eyepiece | |
| cross hairs/reticule: | double vertical hair, single base horizontal hair, two distance hairs, constant 100 | |