10 SETTING ATMOSPHERIC CORRECTION
10-55
8.3.3 縱十字絲之檢校
Adjustment is required if the vertical cross-hair is not in a place perpendicular to the
horizontal axis of the telescope ( since it must be possible to use any point on the hair for
measuring horizontal angles or vertically running lines).
z 檢驗
c Set the instrument on the tripod and carefully level it.
d Sight the cross-hairs on a well defined Point A at a distance of, at least, 50 meters
( 160ft.) .
e Next swing the telescope vertically using the vertical jog and shuttle, and check
whether the point travels along the length of the vertical cross-hair.
f If the point appears to move continuously on the hair, the vertical cross-hair lies in a
plane perpendicular to the horizontal axis ( and adjustment is not required ).
g However, if the point appears to be displaced from the vertical cross-hair, as the
telescope is swung vertically, adjustment is required in the reticle plate.
z 校正
c Unscrew the cross-hair adjustment section cover, by revolving it in the
counterclockwise direction, and take it off. This will expose four eyepiece section
attachment screws.
d Loosen all four attachment screws slightly with the accessory screw-drive (while taking
note of the number of revolutions).
Then revolve the eyepiece section so that the vertical cross-hair coincides to Point A'.
Finally, re-tighten the four screws by the amount that they were loosened.
e Check once more and if the point travels the entire length of the vertical cross-hair,
further adjustment is not required.
Note : Perform following adjustment after completing the above adjustment .
Chapter 8.3.4 "Collimation of the Instrument", Chapter 8.4 "Adjustment of
Compensation Systematic Error of Instrument" .
Eyepiece
Eyepiece section
attachment screws
Eyepiece section
attachment screws
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