RELATION BETWEEN FUNDAMENTAL LINES
1. The
axis of plate levels must be perpendicular to the vertical axis
2. The
line of collimation must be at right angles to the horizontal axis
3. The
horizontal axis must be perpendicular to the vertical axis
4. The
axis of the telescope level or the altitude level must
be parallel to the line of collimation
5. The vertical circle vernier must read zero
when the line of collimation horizontal
IMPORTANT TECHNICAL TERMS
1.
Face left observation
Angles taken
when the face of the vertical circle of
the theodolite is left side of the observer
2.
Face right observation
Angles taken when the
face of the vertical circle of the
theodolite is right side of the observer
3.
Swing of telescope
Rotating the telescope clock wise or anti
clock wise in a horizontal plane about
vertical axis
4.
Transiting
Turning the
telescope through 180 degrees in vertical plane about horizontal axis
5.
Telescope
normal
Vertical
bubble upside and face of the vertical circle at left side of the observer
6.
Telescope
reversed
Vertical bubble down side and face of the
vertical circle at right side of the observer
INSTRUMENTS USED IN THEODOLITE SURVEYING
•
Tripod
•
Plumbob
•
Theodolite
TRIPOD
a.
It is a wooden stand with three
legs
b.
Is used to support the theodolite
c.
Tripod head contains external threads
d.
Tripod legs are fitted with iron
shoes
e.
These legs are pressed into the
ground to avoid shaking
PLUMB BOB
a.
Is used to centre the theodolite
over the station
b.
It consist of a thread and weight
at one end
c.
It is suspended from the hook
provided at the bottom of the theodolite
THEODOLITE
a.
Is used to measure the horizontal
and vertical angles
TEMPORARY
ADJUSTMENTS
a.
Setting up the theodolite over
station
b.
Levelling of the theodolite
c.
Elimination of parallax
CLICK HERE FOR LESSON 1
CLICK HERE FOR LESSON 2
CLICK HERE FOR LESSON 3
CLICK HERE FOR LESSON 4
CLICK HERE FOR LESSON 5
CLICK HERE FOR LESSON 6
CLICK HERE FOR LESSON 7
CLICK HERE FOR LESSON 8
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