to find balance equation in tacheometry calculations
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Procedure:
The theodolite is mounted on the tripod stand.The theodolite is centered over an arbitrarily selected station P from where the staff stations A and B can be sighted without any obstruction and the instrument is levelled using the foot screws.
The theodolite is set on the face right mode and the vernier A on the face right mode and the vernier A on the horizontal circle is initially set at 0°00’00” and the staff station A is sighted.
The central vertical cross hair is made to bisect the staff station A and the central horizontal cross hair is made tangential to 2.0 m mark on the staff station.
The horizontal and vertical angles are recorded by reading the horizontal and vertical circles respectively.
The stadia hair readings for the staff station A are also observed and recorded.
The theodolite is swing to the right and the staff station B is sighted.
The central vertical cross hair is made to bisect the staff station B and the central horizontal cross hair is made tangential to 2.0 m mark on the staff station B.
The horizontal and vertical angle are recorded by reading the horizontal and vertical circle respectively.
The stadia hair readings for the staff station B are also observed and recorded.
The observations are closed on the first staff station A.The vernier A is then initially set 90°00’00” and the horizontal and vertical angles and the stadia hair readings are observed for both the staff stations A and B are recorded by repeating the above procedure.
The theodolite is then set on the face left mode and the horizontal and vertical angles and the stadia hair reading are observed for both the staff station A and B are recorded by repeating the above procedure for the initial settings of 180°00’00” and 270°00’00” on vernier A.
The staff stations are sighted in the same sequence as above but by swinging the theodolite to the left.
The average of the horizontal angles subtended by the line AB at the instrument station P and the vertical angles are found.
The average vertical angles and the staff intercepts are substituted in the relevant expression for horizontal distance for inclined line of sight and vertically held staff and the horizontal distances of the staff stations A and B from the instrument station P are determined by the principles of stadia tacheometry.
hope it helps
The theodolite is mounted on the tripod stand.The theodolite is centered over an arbitrarily selected station P from where the staff stations A and B can be sighted without any obstruction and the instrument is levelled using the foot screws.
The theodolite is set on the face right mode and the vernier A on the face right mode and the vernier A on the horizontal circle is initially set at 0°00’00” and the staff station A is sighted.
The central vertical cross hair is made to bisect the staff station A and the central horizontal cross hair is made tangential to 2.0 m mark on the staff station.
The horizontal and vertical angles are recorded by reading the horizontal and vertical circles respectively.
The stadia hair readings for the staff station A are also observed and recorded.
The theodolite is swing to the right and the staff station B is sighted.
The central vertical cross hair is made to bisect the staff station B and the central horizontal cross hair is made tangential to 2.0 m mark on the staff station B.
The horizontal and vertical angle are recorded by reading the horizontal and vertical circle respectively.
The stadia hair readings for the staff station B are also observed and recorded.
The observations are closed on the first staff station A.The vernier A is then initially set 90°00’00” and the horizontal and vertical angles and the stadia hair readings are observed for both the staff stations A and B are recorded by repeating the above procedure.
The theodolite is then set on the face left mode and the horizontal and vertical angles and the stadia hair reading are observed for both the staff station A and B are recorded by repeating the above procedure for the initial settings of 180°00’00” and 270°00’00” on vernier A.
The staff stations are sighted in the same sequence as above but by swinging the theodolite to the left.
The average of the horizontal angles subtended by the line AB at the instrument station P and the vertical angles are found.
The average vertical angles and the staff intercepts are substituted in the relevant expression for horizontal distance for inclined line of sight and vertically held staff and the horizontal distances of the staff stations A and B from the instrument station P are determined by the principles of stadia tacheometry.
hope it helps
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