This is the third-order theodolite, which was made in 1956. The instrument has an interesting design, as does the Carl Zeiss Jena instruments of the 1950s. The instrument comes in an old-fashioned, but robust, wooden case. It has a good level of functionality and is absolutely structurally stable.
The theodolite is made of aluminium and has a modern appearance. It is the first model of the Carl Zeiss Jena optical theodolites with a linear position scale with 1:25,000. It has a true-level mechanical horizontal circle and an axis circle with a tension screw. The instrument has a true-level optical horizontal circle and a level-driven axis circle with a telescope compensator.
The instrument has the ability to determine the position of the circles and the direction of the axis of the instrument with respect to the geographical coordinates. It has an additional function which can be used as a sighting instrument. The sighting function provides the same parameters as the theodolite functions. The sighting instrument is mounted on the top of the theodolite. It can be used as a lineal guide or as a sighting instrument, and the sighting instrument is mounted on the theodolite column.
The third-order theodolite was made in 1970. The instrument is similar to those of the classic Jena theodolites and provides additional functions. It is equipped with a lens for the replacement of lenses, automatic zenith distance and spherical bearing clamp, which allows accurate measurements while moving and fixing the sphere. The instrument has a wide measuring range of up to -35°/+45°. In addition, the measurement precision is up to one nanometre.
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