What is face left position?
Face Left: If the vertical circle of the instrument is on the left of the observer while taking a reading, the position is called the face left and the observation taken on the horizontal or the vertical circle in this position is known as the face left observation.
Why face left and face right observation are required?
Reading an angle face right and face left will eliminate the errors due to the non adjustment of the line of collimation and the trunnion axis. We won’t do any adjustment and assume the instrument is calibrated. Both axes of a theodolite are equipped with graduated circles that can be read out through microscopes.
What is FL and FR in surveying?
After correctly setting up the theodolite and sighting a target point, we take readings on the horizontal and the vertical circle in both face left (FL) and face right (FR) positions.
What is face left in theodolite?
Face Left Condition : If the vertical circle is on the left side of t,he observer, the theodolite is in the face left condition. Normally, the face left condition is used in practice.
What is the difference between transistor and swinging of telescope?
Explanation: Swinging the telescope means a continuous motion of the telescope about its vertical axis in the horizontal plane. Transiting the telescope means the procedure consisting of revolving the telescope through 180° in a vertical plane about its horizontal axis.
What is telescope normal?
Telescope normal :- The face left position is known as ‘Telescope normal’ or ‘Telescope direct’ or ‘Bubble up’. 13. Telescope Inverted :- The face right position is known as ‘Telescope Inverted’ or ‘Telescope reversed’ or ‘Bubble down’.
What is face right observation?
(ii) Face Right: When the Vertical Circle of a Theod is situated on the right of the observer and the observation or reading taken with this face is called Face Right Observation or Reading.
What is collimation line?
Line of collimation : Line joining the intersection of the cross-hairs to the optical center of the objective and its continuation. It is also know as Line of sight. Line of sight : is defined as the intersection of the cross hairs and the optical centre of the objective lens.
What is the difference between transiting and swinging?
When you transit the telescope you rotate the telescope about?
Transiting :- Transiting is also known as plunging or reversing. It is the process of turning the telescope about its horizontal axis through 1800 in the vertical plane. TERMS USED IN MANIPULATING A TRANSIT VERNIER THEODOLITE. It means turning the telescope about its vertical axis in the horizontal plane.
Which is more attractive left or right side of face?
Face’s Left Side More Attractive Than Its Right Side, Study Shows. Which is your better side? New research shows that the left side of the human face is generally more appealing to others than the right side–which may help explain why portraitists tend to paint their subjects’ left profiles.
What is the meaning of’face left’and’face right’?
If anyone can help then that would be great. The terms “Face Left” and “Face Right” originally refered to which side of the telescope the vertical circle of a theodolite lay when the telescope was reversed by rotating it 180° about its tilting axis.
Do you know the difference between your right and left eyebrow?
If you imagined that there is a line dividing your face vertically into right and left sides you will notice that the two sides aren’t similar!! Your right eyebrow may not look exactly like your left eyebrow; the face lines at one side of your face may be different than those on the other side and so on.
Which side of the telescope is the face left?
It the vertical circle was on the left side of the telescope from the observer’s point of view at the eyepiece, that was the Face Left position. An alternate terminology is “Face I” and “Face 2”.