In setting out a long straight line for the position of transmission towers, it is recommended that the forward point be set out with face-right and face-lett with reference to preceding point and the mean position taken. This field procedure eliminates instruments error where the-A-trunnion axis is not perpendicular to vertical axisB-vertical axis is not perfectly vertical time of observationC-line of collimation is not perpendicular to the vertical axisD-line of collimation is not perpendicular to the horizontal axis-D-line of collimation is not perpendicular to the horizontal axis

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D line of collimation is not perpendicular to the horizontal axis Please explain the answer.

UPSC Civil Service Exam Questions - Engineering

In setting out a long straight line for the position of transmission towers, it is recommended that the forward point be set out with face-right and face-lett with reference to preceding point and the mean position taken. This field procedure eliminates instruments error where the

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UPSC Civil Service Exam Questions - Engineering

In setting out a long straight line for the position of transmission towers, it is recommended that the forward point be set out with face-right and face-lett with reference to preceding point and the mean position taken. This field procedure eliminates instruments error where the

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