9
7. ORDER OF OPERATION
7.1. Operation with telescope
Before mounting the telescope it is required to choose a place and prepare a
site. It must be even and solid. Mount the telescope on the site and check it for
reliable stability.
For pointing to an object the telescope should be rotated about two axes.
For rotation of the declination axis it is necessary to undo braking screw 8
(fig. 5), rotate the telescope and screw in the braking screw.
If backlash is arisen in the worm gear it is necessary to disengage drive 7
(fig. 9). For this purpose it is required to take off cover 3, slacken three screws
8, displace drive 7 upwards and fix it with screws 8. Remove handwheels 4 after
unscrewing screws 5. After that slacken screws 6 which fasten worm 9 in the
bearings. After pressing the worm to worm wheel 0 fix it with screws 6. Mount
handwheels 4 and secure them with screws 5. Then slacken screws 8, displace
the motor downwards until engagement with the toothed wheel of the worm takes
place and secure them with screws 8. Mount cover 3 on the casing.
The smoothness of rotation of toothed wheel together with the toothed wheel
of worm 9 is checked by rotation of the handwheels, in doing so probable sliding
or jamming of the friction clutch may take place.
For its adjustment it is required to displace cap 2 and tighten or slacken three
screws 3. The friction clutch adjustment is considered to be finished if handwheels
4 rotate smoothly.
The telescope rotates about the polar axis owing to minor effort and is not fixed.
The axis is connected to the watch drive with the help of a friction mechanism.
The celestial sphere and all astronomical objects perform a complete rotation
for twenty-four hours. As a result the object in the telescope field of view displaces
constantly. The speed of its displacement increases with the increase of the
telescope magnification. Therefore, the telescope is provided with electric clock
drive 8 (fig. 5) which rotates uniformly the telescope, which follows the object.
As a result, in the process of observation the object remains constantly at the
center of the field of view.
In the process of observation it is often required to perform minor corrections
in the diurnal run of the telescope. For this purpose one makes use of handwheels
4 (fig. 9) of the polar axis
or the buttons 3 (fig. 6) of the control panel. The
buttons 3 speed up or slow down the tracking speed of the watch drive relative
to the nominal providing the correction of right ascension angle. The correction
modes are activated when one of the buttons 3 is pressed continuously and the