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 these tubes is the right and another is the coude one. The specificity of
the determination 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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