but slightly larger than, the 1-min theodolite. TheWILD theodolite shown in figure 11-20 iscompact, lightweight, dustproof, optical reading,and tripod-mounted. It is one spindle, one platelevel, a circular level, horizontal and verticalcircles read by an optical microscope directly to1 sec (0.002 roil), clamping and tangent screws forcontrolling the motion, and a leveling head withthree foot screws. The circles are read using thecoincidence method rather than the direct method.There is an inverter knob for reading thehorizontal and vertical circles independently. Theessential parts of a l-see theodolite are verysimilar to that of the 1-min theodolite, includ-ing the horizontal and vertical motions, thelevels, the telescope,the tribrach, and theoptical system shown in figure 11-21. Themain difference between the two types, besidesprecision, is the manner in which the circles areread.The CIRCLE to be viewed in the 1-seetheodolite is selected by turning the inverterknob on the right standard. The field of thecircle-reading microscope shows the image of theFigure 11-21.-Circle-reading optical system.11-25
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