ABSTRACT
In order to obtain coordinates, a mathematical model is set up, which may consist of a chain or a network of triangles or a traverse, where distances and angles are to be measured. This chapter discusses the adjustment of triangulations. The actual base line measurements, however, will not be dealt with, as they have become less important since the introduction of electronic equipment for distance measurement. Two components must be considered in assessing the precision: the precision of pointing, which depends on the telescope and the atmospheric conditions, and the precision of reading the circle. The internal adjustment of a chain consists of the adjustment of triangular contradictions only. This is a simple procedure if the angles in each triangle are observed independently and with an equal precision. A free network as mentioned in the literature is nothing else than a network adjusted for internal consistency only.
