10
Use the plumb bob provided and set up the instrument directly above the
surveying point. Sight the objective and set the horizontal circle to 0 degrees
by turning the horizontal circle positioning knob. Loosen the clamp, turn the
telescope to view the second observation of your angle. Retighten the clamp
and use the fine motion tangent screw can to bring crosshairs precisely on
line with the tangent objective. Using the index line seen in the circular
viewer, take the angle reading. The index line can be used for reading the
circle in increments finer than single degrees. This process is for estimation
but the average user can position the index line for finer readings.
NSL500B TRANSIT LEVEL USES AND APPLICATIONS
The NSL500B transit level has all the same functions and capabilities as the
NSL100B level. By unlocking the lock lever, you make the instrument
capable of measuring vertical angles.
A vertical dial is attached to the telescope and is read through an index
pointer. Vertical angles can generally be read /- 45
°
.
