Carl Zeiss Jena Koni 007
precise level with horizontal circle Carl Zeiss Jena Koni 007
record number: 62
instrument type: precise level with horizontal circle
manufacturer: Carl Zeiss Jena
serial number: 139292
model: Koni 007
weight: 4.19 kg
dimensions (l/w/h): 13/14/33 cm
year of manufacture: 1960
instrument set up: protected circular level
compensator
micrometer with pentagonal prism
natančnost: 0.5 mm/km

The precise compensating level with horizontal circle was made in 1960. The instrument has a sensitive mechanical compensator built in, giving the level the shape of a periscope. The compensator takes up most of the space of the vertical pipe. The micrometer screw is used to operate the pentagonal prism, the graduation unit of the micrometer is 0.05 mm. The characteristic crosshairs, which split into a wedge, enable precise sighting of the staff lines with a half-centimeter division. The micrometer can be attached with a clamping screw so that the instrument can be used as a level of normal precision.

The horizontal circle has a sexagesimal division with a graduation unit of 10', which, in combination with the Reichenbach distance meter, serves for less precise polar measurements. The division is read through a line microscope.

The instrument is a legend among precise levels. Its functionality and precision are the reason why it has been used for many decades in the measurement of height nets, and especially in engineering geodesy. You can still see it on a building site today. The instrument is in the same condition as when it was originally taken out of service.

Characteristics
horizontal circle
diameter: protected, 53,4 mm
type of division: engraved division
limb implementation: glass bracket
division: sexagesimal/sexadecimal
unit: 10'
Reading
number of reading points: 1
reading device: line microscope
number of units: 100
graduation unit: 0,05 mm
Telescope
diameter of objective: 40 mm
magnification: 30,5 x
type: telescope with internal focusing
cross hairs/reticule: wedge crosshairs with two distance hairs, constant 100