TM 5-6675-250-10
2-7. OPERATING PROCEDURE - Continued
THEODOLITE READING - Continued
e.
Adjust the MICROMETER control (1) to
center the fixed INDEX between the near-
est double lines on the horizontal scale.
f.
Read the horizontal scale as follows:
(1) If the FIXED INDEX mark is under a
three digit number, record the num-
ber and add a zero as the fourth digit.
(2) If the FIXED INDEX is under a number
five, record the three-digit number
immediately to the left of the number
five and add a five as the fourth digit.
NOTE
Instructions for obtaining the vertical angle
are given as an optional procedure. If the ver-
tical angle is not required, disregard the
instruction to read the vertical scale.
Read the vertical scale in the same man-
g.
ner as the horizontal scale, except in this
case, the bubble of the altitude level must
b e centered prior to centering FIXED
INDEX.
h.
Read the VERNIER scale as it appears on
the instrument.
i.
Obtain the direct azimuth reading by add-
ing the horizontal scale and the vernier
scale reading.
2-50
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