The peculiarity of the system of the azimuthal horizontal instrument type III lies in fact that there are two terrestrial telescope tubes with a combined eyepiece part. One of the tubes is the right and another is the coude one. The specificity of the value of the micrometric screw R for both tubes is described briefly. It is recommend, the RCT for the coude terrestrial telescope tube from observations of a pairs for scream evaluation of direct or indirect methods to determine firstly, and the RRT for the right terrestrial telescope tube from the combine observations of a scale azimuth mark to determine afterwards.
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