8
9
Fig. 3
.
Equatorial Mounting:
1 - polar axis; 2 - screw of axis brake; 3 - folding clips;
4 - handwheel of micrometer screw of polar axis; 5 - declination axis;
6 - circle of declination; 7 - counterweights; 8 - hendle;
9 - bracket with scale of latitudes; 10 - circle of hour angles
4. DESIGN AND PRINCIPLE
OF OPERATION OF TELESCOPE
The telescope
(fig. 1,2) consists of three basic units: the telescope tube,
equatorial mounting, and pier with supports or tripod.
The tube 1
is the basic part of the telescope, which embodies the optical
units: objective lens, eyepieces, and finderscope.
Eyepiece parts 3
consist of the following units: focusing mechanism, diagonal
mirror, set of symmetrical eyepiece f'=25 and 6.3mm mounted with the fitting
place of 31.8 mm (1.25).
Finderscope 2
is a scope with 6
x
magnification and field of view of 8°.
It is completed with blind 6 (fig. 5) which is mounted on objective lens.
The equatorial mounting
(fig. 3) consists of polar axes 1 and declination
axis 5 perpendicular to the polar axis.
Fastened on one end of the declination axis is the saddle with hinged clips
3 in which the telescope tube is mounted; fastened on the other end of the axis
is the counterweights 7 which can move along the axis for balancing the
telescope tube.
The casing of the polar axis is fastened on the bracket 9 provided with a
scale of latitudes by which the polar axis is set to the latitude of the observers
site. Position of polar axis can be fixed with the help of handle 9. Setting circle
6 on the declination axis, which shows the object declination, is figured from
0 to 90° with a division value of 2°. Circle 10 positioned on the polar axis (the
circle of hour angles) is figured from 0 to 24 hours with a division value of 10
minutes.
The declination
axis has braking screw and mechanism of slow motion,
which moves the tube in the range of ±4°. By using this mechanism it is possible
to correct the position of the object in the field of view.
Pier 6
(fig. 1) consists of a pipe with three supports 5.
The tripod
(fig. 2) allows to adjust a height of telescope and to fix each leg of
tripod with the help of stops 1 and 2. Also it is completed with table 3.
5. OPTICAL TRAIN
The telescope tube (fig. 4) is a refractor with achromatic objective lens 1. It
provides a high quality of image with a resolution limit of diffraction level.
Telescope tube is completed with three changeable eyepieces 3 f'=25mm
and f'=6.3mm.
1
2
3
4
4
5
6
7
8
9
10
