Your Berger Instrument should now be leveled up, but to be certain, double-check.
Rotate the instrument 180° so the vial is reversed. If the bubble will not center when
reversed, follow adjustment procedure outlined under "Bubble Adjustments."
NOTE: Bubble adjustments must be correct if proper results are to be obtained
using the instrument.
3. BUBBLE ADJUSTMENTS
If the telescope bubble does not remain centered after having leveled the
instrument, and reversed the telescope end for end (180°) (as described under the
chapters entitled “Leveling the...Instrument”) the need for adjustment is indicated.
Use a screwdriver.
With an adjusting screw "A" facing to the right of the bubble and with telescope
directly in line with two of the three leveling screws, note to which side the bubble is
off. If to the left, loosen screw "B" very slightly to remove
ONE-HALF
the error.
Remove the other half of the error with the two level screws in line with the
telescope. If the bubble is still not exactly centered, repeat the procedure.
If bubble is off to the right, tighten screw "A". Otherwise, the procedure is identical
(
Fig. 3
).
4. PLATE BUBBLE ADJUSTMENT
After completing the above adjustment, if your model also has a plate (bottom)
bubble, check its adjustment. If off to the left, adjust by loosening right screw and
tightening left screw removing ALL the error in this case by bringing bubble to
center. If off to right, reverse the procedure. On models equipped with a capstan
type screw, use pin and raise or lower screw as required to center bubble.
NOTE: Bubble will always run to the high side. Therefore, lower adjustment if
bubble is toward adjusting side, or raise adjustment if bubble is away from
adjusting side.
Berger Instruments • 5
1. SETTING UP THE INSTRUMENT ON THE TRIPOD
Your instrument is packed in a carrying case of modern design which affords
maximum protection against weather, shock, and vibration. Note how the instrument
is stored so it can be replaced in the case in the same position.
Before removing the instrument from its carrying case, set up your tripod in a stable
position with the tripod legs tightened securely.
This instrument attaches to the tripod using a 5/8-11
instrument fastening screw. Place the instrument on
the tripod and hold in place with one hand. Reach
under the tripod head and grab the instrument
fastening screw. Push the screw up into the hole in the
base of the instrument and tighten until the instrument
is secure. (See Fig 1.)
2. LEVELING THE THREE SCREW INSTRUMENT
Instruments utilizing three leveling screws are mounted on the tripod and leveled in
the following manner:
Mount the instrument on the tripod. Lock the
telescope in place with the lock lever and line up the
telescope vial in position #1 as shown (
Fig. 2
). Then
grasp screws A & B so that both thumbs are moving in
opposite directions, either toward each other or away
from each other. Note that the bubble moves in the
same direction as your left thumb. Do not permit the
screws to come completely out of their bushings.
Keep about half the length engaged. When the bubble
is centered in position #1, turn the instrument and
observe the vial in position #2. Now center the bubble
in position #2 using only screw C.
4 • Berger Instruments
Fig. 1
Instrument fastening screw
(under the tripod platform)
A
B
C
VIAL
POSITION
#1
A
B
C
Fig. 2
Fig. 3
