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BASIC CONSTRUCTIONAL FEATURES OF THE
PRINCIPLES OF THEODOLITE CONSTRUCTION
FEATURES OF MODERN THEODOLITES
10 other sections not shown
30 Auto accuracy adjustment alidade altitude level anallactic angular automatic index automatic levels axis system backsight beam bubble centre circle graduations clamp Coinc compensator components controlling microprocessor correct cross-hairs described in section device diode direction display dumpy level effects electronic theodolite Elta eyepiece field of view focal length footscrews Gray code Hewlett-Packard horizontal angle horizontal circle reading horizontal plane illustrated in Fig infinity focus instrument intersection Japan 30 laser line of collimation line of sight magnification measured method micro micrometer mirror normal Oberkochen objective observations optical axis optical micrometer optoelectronic perpendicular photodetectors photodiode plate level plumb-bob position principal tangent prism refraction result reticule screw set-up sexagesimal shown in Fig signal spherical level spirit level staff reading standing axis surface tacheometer target telescope theodolite tilt sensor tilting level tribrach trunnion axis vertical angle vertical axis vertical circle vial Zeiss zero