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International Media Interoperability Framework. IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. The operating knobs are in logical sequence and thus assure operating convenience. Both tangent screws are equipped with coarse and fine drive, providing precise pointing.
Two-speed vertical and horizontal slow motion screws. A mechanical speed reduction is built into both tangent mechanisms. When pointing with the coarse drive, the telescope reticule intersect is moved slightly past the target.
When retracting, the speed-reduction gear is automatically engaged, thus at the same rate of knob rotation, the rate of reticule movement is reduced to half speed. As a result, more precise pointing is achieved. The digital circle readout for both horizontal and vertical circles appears simultaneously in the circle reading eyepiece. A glare-free readout is assured by a yellow-green filter, hence no tiring of the eye. Essential for a one-second theodolite, the DKM2-A has the reliable Kern double-circle reading principle.
All parts influencing the measuring accuracy are mounted on a steel plate in the immediate vicinity of the circle. The resulting answer, projected to the reading eyepiece by viewing optics is therefore undistorted.
Up to and including the 10 second graduation, all values are read and directly in digits. The tiring and error-producing reading of divisions or estimating of intervals, is eliminated. Only the single second must be read on the scale graduations. Coarse and fine drive for circle orientation. The horizontal circle is quickly rotated through degrees with the coarse drive and set easily and precisely to any desired value with the fine drive.
The "collection Kern" as the estate of a once successful, global industrial company is an important part of the history of technical and industrial culture.
AG instrument. Dating of Kern instruments is sometimes difficult because of two mainly reasons: pre , instruments like levels and theodolites did not have serial numbers on drawing sets, they also used old items with old logos in newer sets I have a set where they used logos from three periods June 1.
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