Ada DIGITEO-2 А00226 [20/58] Digi teo 2 5 10 20

MEASUREMENT FOUNDATION

DigiTeo-2/5/10/20

f. Loosen the vertical motion clamp and tangent screw and plunge the instrument 180 ° or 200gon and x a sight on point C, which

should coincide with the previous point B.

g. If point B and C do not coincide, adjust in the

following order:

Adjustment:

a. Unscrew the cross-hair adjustment section cover.

b. Find point D at a point between points C. B, which should be equal to 1/4 the distance between points B and C, and measured from

point C. This is because the parent error of BC is four times of the real error since the lescope has been reversed twice during checking

operation.

c. Shift the vertical cross-hair line and coincide it with point D, by revolving the left and right capstan adjustment rews. Upon complet-

ing the adjustment, repeat the checking operation once more. If point B and C coincide, further adjustment is not required. Otherwise,

repeat the adjustment.