Vixen AP Equatorial Mount Instruction Manual page 12

BEFORE USE
Mount Specifications
Mount Head
The mounting block is designed to attach an optical tube with dovetail
tube plate (or dovetsail slide bar). The optical tube is firmly fixed with
both the lock screw with large grab knob and safety screw. This allows
quick set up and removal of the optical tube.
Counterweight Bar
The optical tube mounted on the
equatorial mount has to be balan-
ced with a counterweight to use the
equatorial mount properly.
Right Ascension (R.A)
If the AP mount is set to be aligned with one rotational axis parallel to the
Earth's axis, th e motion of R.A will follow th e motion of stars.
Declination (DEC)
If the AP mount is set to be aligned with one rotational axis parallel to
the Earth's axis, the motion of DEC will be angled to the motion of the
R.A.
Counterweights
Counterweight bar
-
Mount head
Optical Tube
North
12
Dovetail-plate tube plate
Safety screw
Counterweight bar
Counterweights
DEC axis
Polar axis
Lock screw