DEFINITIONS OF FUNCTIONS
1.
Centering:
The setting of the Theodolite exactly overs a station mark by
means of a plumb bob is known as centering
2.
Transiting:
The method of turning the telescope about its horizontal axis
in a vertical plan through 180 degree is termed as transiting.
3.
Face Left:
‘Face left’ means the vertical circle of the theodolite is on
the left on the observer at the time taking reading.
4.
Face Right:
This refers to the situation when the vertical circle of the
instrument is on the right side on the observer when the reading is taken.
5.
Telescope Normal:
The face left position is known as the ‘telescope normal’ or
‘telescope direct’. It is also to a referred to as bubble up.
6.
Telescope inverted:
The face right position is called the ‘telescope inverted’ or
‘telescope reversed’. It is also to a referred to as bubble down.
7.
Changing Face:
The option of bringing the vertical circle from one side of
the observer to the other is known as changing face.
8.
Swinging the Telescope:
This indicates turning of the telescope in a horizontal plan.
It is called right swing when the telescope is turned clockwise and left swing
when the telescope is turned anticlockwise.
9.
Line of the Collimation:
It is an imaginary line passing through the inter section
from the cross hairs at the diaphragm and the optical center of the object
glass and its continuation.
10. Axis of the
Telescope:
The axis is an imaginary line passing through the optical
center of the object glass and the center of the eyepiece.
11. Axis of the
Bubble Tube:
It Is an imaginary line tangential to the longitudinal curve
of the bubble tube at its middle point.
12. Vertical Axis:
It is the axis of the rotation of telescope in the horizontal
plan.
13. Horizontal
Axis:
It is the axis of the rotation of telescope in the vertical plan.It
is also known as the turning axis.
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