Special Catalogue of the Collective Exhibition of Scientific Instruments And App
Special Catalogue of the Collective Exhibition of Scientific Instruments And App
Berlin Deutsche Gesellschaft Fr Mechanik Und Optik
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Fii?. 4. Albert Ott, Kempten. > 57 12. A Theodolite (Tacheometer) (Fig. 4), latest construction, Patented in Germany to the inventors, Messrs. Tichy and Ott; particu- lary suitable for accurate and speedy work in land-surveying. The circles are divided on the 360 degrees system, but do not read to minutes and seconds, but to -y^y degrees. Distances are measured, by a new method, by means of a staff divided in logarithmic progression, which has to be set up strictly vertical, two supports and cr...ossed levels being appended for this purpose. By this method distances are measured much more exact!}* than is possible with other optical distance measuring instruments. In order to find from the slanting distance the horizontal distance the altitude arc has, beside the ordinary graduation, logarithmic divisions. By subtracting the altitude reading from the height on the staff the reduced distance is directly obtained from ordinary tables of logarithms, . And from this and the altitude the difference of elevation .
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