TM 5-6675.307-14
Figure 2-16. Circular level, adjustment.
d. Line of Sight.
(1) Testing.
(a) Reverse telescope and aim at a well defined point at least 330 feet away.
(b) Transit telescope on its vertical axis and note point that appears on vertical cross line at about same
elevation and distance as first point.
(c) Turn theodolite horizontally and aim at original point.
(d) Transit telescope on its vertical axis. Vertical cross line should fall on second point. If it does not,
proceed as given in step (2) below.
(2) Adjustment. If vertical cross line failed to fall on second point as described in step (1) above, make sure
instrument remains in position, and proceed as given in figure 2-17.
2-17
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