Ada PROF-X6 А00160 [29/36] Adjusting the theodolite

Ada PROF-X6 А00160 [29/36] Adjusting the theodolite
29

PROF 8 Stadia measurement There are two pairs of short hairs on the graduated plate of the telescope i e stadia hairs They are used to measure the distance between the target to be measured and the measurement point of the instrument Assume the distance between the staff and the measuring point is D The length cut by a pairs of the stadia hairs on the scale is L and constants of the stadia are K and C which are 100 and 0 respectively The distance measurement formula is following D KL C 100L Formula of horizontal distance taking into account a slope D KLC OS a where a a vertical angle of slope Formula for calculation the exceeding between points H 0 5 kL siin2a 1 v where I height of theodolite v height of aiming at the staff 9 Using the rotary circle mechanism Theodolites Prof X6 X10 are equipped with a rotary circle knob 6 It enables the reading value of the horizontal graduated circle to be placed in the direction of the target to be measured To avoid errors it is necessary to aim at the target to press the locking catch of the rotary knob 6 and press the knob 6 simultaneously Then rotating the knob 6 in the counter clockwise direction set the necessary reading After this procedure press the locking catch again to unlock the limb 6 ADJUSTING THE THEODOLITE All instruments are adjusted and checked and then transported to users after careful packing But nevertheless before usage it is necessary to repeat the adjustment as the transportation and storing conditions may tend to engender the possibility of deviation from correct positions adjusted originally Such adjustment should be done as follows 1 Adjusting the tubular level of the alidade Turn the alidade so as to enable the tubular level to be parallel with the line connecting the centers of any two of foot screws 29 MEASUREMENT FOUNDATION

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