9
tube. The smoothness of the tube movement can be controlled. For this
purpose the left handwheel is held by one hand and the right handwheel
is rotated clockwise (with some effort) relative to the left handwheel by
the other hand. The chosen position of the tube can be fixed in this way,
if necessary.
Fig. 3.
Primary mirror:
Fig. 4.
Diagonal mirror:
- set screw; 2 - adjusting - adjusting screw; 2 - set
screw screw
The telescope is complete with six light filters 6 (fig. 9)
The equatorial mounting
(fig. 5) consists of polar axes 0 and
declination axis 3 perpendicular to the polar axis.
Fastened on one end of the declination axis is the saddle with hinged
clips in which the telescope tube is mounted; fastened on the other
end of the axis is the counterweights 5 which can move along the
axis for balancing the telescope tube. Solar-screen (fig. 9) can be
fastened on the same axis as well.
The casing of the polar axis is fastened on the bracket 7 (fig. 5) provided
with a scale of latitudes by which the polar axis is set to the latitude
of the observer’s site.
The southern (lower) end of the polar axis embodies electric clock drive 8,
the northern (upper) end embodies the casing of declination axis 3.
Both axises are provided whith a setting circles which shows an
hour angle or declination of the object visible in the telescope field of
view. Setting circle 4 on the declination axis which shows the object
