12
axes. The fine focusing is performed by means of the micrometer
screws 5 in the range of ±4° relative to the declination and polar axes.
The pier 6
(fig. 1) is composed of tube which is fixed on three supports 7.
The tripod
(fig. 2) allows to adjust a height of telescope and to fix
each leg of stops 1 and 2.
The Newton system is used in the telescope. Observations are per-
formed through the tube on which the finderscope is positioned. The
tube axis is set in the required position with the help of the equatorial
mounting.
4.2. Optical train
The reflecting telescope is provided with the Newton optical system
(fig. 7).The parallel beam of rays enters the telescope tube, falls on
the primary mirror 1 with the focal length of 805 mm and, after reflect-
ing from it in the diagonal mirror 3, refracts at 90° and is viewed with
the help of the eyepiece 2.
Optical Train of Finderscope
The optical train of the finderscope is shown in fig.7. The finder-
scope is composed of the objective, reticle and eyepiece.
