BUBBLE ADJUSTMENTS
If the telescope bubble does not remain centered after having lev-
eled 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 tele-
scope. If the bubble is still not exactly centered, repeat the proce-
dure.
If bubble is off to the right, tighten screw "A". Otherwise, the proce-
dure is identical (Fig. 3).
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