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25.OPTIONAL ACCESSORIES
The following are optional accessories which are sold separately from the OS.
Power supply and target optional accessories: "23. POWER SUPPLY SYSTEM", "24. PRISM
SYSTEM".
Plumb bob
The plumb bob can be used to set up and center
the instrument on days when there is little wind.
To use the plumb bob, unwind its cord, pass it
through the cord grip piece as shown in the figure
to adjust its length, then suspend it from the hook
attached to the centering screw.
Tubular compass (CP7)
Slide the tubular compass into the tubular com-
pass slot, loosen the clamp screw, then rotate the
top part of the instrument until the compass nee-
dle bisects the index lines. The telescope's face 1
sighting direction in this position will indicate mag-
netic north. After use, tighten the clamp and
remove the compass from the slot.
• The tubular compass is susceptible to the
influence of nearby magnets or metal. Such
influence could cause it to fail to accurately
indicate magnetic north. Do not use magnetic
north as indicated by this compass for base line
surveying.
Telescope eyepiece lens (EL7)
Magnification: 40X
Field of view:
1° 20
'
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