TM 5-6675-307-14
Table 2-1. Controls and Indicators--Continued
Name
Description
Purpose
Vertical tangent clamp screw
Knurled knob
Lock elevation tangent screw to
telescope
Repetition clamp
Two position rotary knob
Lock horizontal circle to the alidade
Battery case rheostat
Adjustable resistor
Controls degree of bubble, circle, and
Compass needle lock knob
Knob
Locks needle when compass not in use
Hand lamp knob
On-off switch
Energizes hand lamp bulb (fig 2-9)
Section IV. OPERATION UNDER USUAL CONDITIONS
2-8.
General
2-9.
Adjustments
Instructions in this section are for the information and
a. Pre-Adjustment Procedure. Before assuming
guidance of personnel responsible for operation of the
theodolite under normal conditions. This section gives
that adjustments are necessary, make sure that the
instructions on handling and preparation for operation of
condition of the instrument is causing the apparent lack
the theodolite basic motions to perform the specific
of adjustment and that the deficiencies noted are not
tasks for which the equipment is designed. Since nearly
caused by improper testing.
To properly test an
every job presents a different problem, the operator may
instrument in the field, proceed as follows:
have to vary given procedures to fit the individual job.
(1) If possible, choose a cloudy day.
(2) Set up instrument as shown in figure 2-8
and paragraph 2-2).
2-14