12
2.3. Measuring distance using the stadia
lines
Using the top and bottom stadia lines
on the reticle, the distance between the
center of the instrument and the staff can
be measured approximately. Aim the tel-
escope at the staff, read the number of
centimeters on the staff between two
stadia lines, then transform it into num-
ber of meter by multiplying 100, and
the number of meter is the distance be-
tween the center of instrument and the
staff.
(See fig. 6)
1. stadia lines
2. cross lines
Regular checking/adjusting
1. Checking and adjusting of the circu-
lar level
∙ Adjust the leveling screws to center
the bubble in the circular level.
∙ Turn the instrument 360°. If the bubble
is still in the center, it means that the
circular level is workable.
∙ If the bubble shifts away from the
center, please adjust according to fol-
lowing methods:
∙ Move the bubble one half of the shift
to the center of the circular level by
adjusting the leveling screws. Then
Fig. 6:
1
2
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