Why face left and face right observations are taken?

Why face left and face right observations are taken?

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.

Which of the following errors can be eliminated by taking the mean of both face observation?

∴ By taking the mean of both face observation, we eliminate error due to line of collimation not being perpendicular to the horizontal axis.

What is face left and left observation?

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 is it good surveying practice to measure angles using both face left and face right when using a theodolite?

The purpose of measuring an angle on each of those two different telescope positions or faces was to cancel certain errors resulting from the fact that the tilting axis may not have been perfectly perpendicular to the turning axis of the instrument and that the line of sight of the telescope (its “axis of collimation” …

What are the errors eliminated by repetition method?

Explanation: By a method of repetition the following errors can be eliminated. They are errors due to eccentricity, errors due to in adjustments of line of collimation, error due to inaccurate graduations, error due to inaccurate bisection of the object etc.

Which of the following errors can be eliminated by taking both face observations in theodolite?

Detailed Solution Eliminated by reading angles from both the faces.

Which errors Cannot be eliminated in surveying?

1) Instrumental: Error may arise due to imperfection or faulty adjustment of the instrument with which measurement is being taken. For example, a tape may be too long or an angle measuring instrument may be out of adjustment. Such errors are known as instrumental errors.

What is the difference between face right and face left?

Face right is when the vertical circle of an instrument is in the right side of the observer and face left is when vertical circle of an instrument is in left side of the observer while taking the readings during survey.

What is the difference between face left and face right?

Which instrument is designed more precise to measure vertical and horizontal angles?

The theodolite
The theodolite is the most precise instrument designed for the measurement of horizontal and vertical angles.

Which of the following errors is not eliminated by the method of repetition of?

Which of the following errors cannot be eliminated by taking both face observations?…