20-1
20 SPECIAL ACCESSORIES
20
SPECIAL ACCESSORIES
The following are optional accessories which are sold separately from the GM.
Target and power supply optional accessories: see Section 21 “BATTERY SYSTEM”. and 22
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 compass slot,
loosen the clamp screw, then rotate the top part of the
instrument until the compass needle bisects the index lines.
The telescope's Face 1 sighting direction in this position will
indicate magnetic 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'
Diagonal eyepiece (DE27)
The diagonal eyepiece is convenient for observations near
the nadir and in narrow spaces.
Magnification: 30X
After removing the handle from the GM, loosen the
attachment screw to remove the telescope eyepiece. Then
screw the diagonal lens into place.
Handle removal method: see Section 1.1
Solar filter (OF3A)
During solar observation, attach it to the objective lens of
the GM to protect its interior and the eyes of the operator.
The filter part can be flipped up without being removed.
Tubular
compass
slot
DE27
