26) What is the name of theodolite with one of its telescope cannot be revolved through 180 Degree in a vertical plane about its horizontal axis?

27) what is the technical term for the process of bring the vertical axis of theodolite immediately over a mark or station point?

28) What is the term for rotating the telescope in horizontal plane about its vertical axis?

29) Which method errors due to eccentricity of the spindles are eliminated by reading both the Vernier of the theodolite?

30) What is the name of traversing that is used for running survey lines of a closed or open survey?