TM 11-6660-218-12
CHAPTER 3
OPERATING INSTRUCTIONS
Section I. PRELIMINARY OPERATING PROCEDURES AND OBSERVATION OF
EQUIPMENT FUNCTIONS
e. Telephone. Refer to TM 115805-201-
3-1. Controls and Indicators
1 2 for information concerning the
a. Anemometer (fig. 1-8).
controls on Telephone Set TA-312/PT.
Function
Control or indicator
f. Theodolite Set. Refer to TM 11-6675-
200-10 for information concerning the con-
Range selector _ _ _ _ _ __ _ _ _ _- Determines the size of the
trols and indicators on the theodolite set.
vent exposed to the wind
when windspeed is meas-
g. Timer (fig. 120).
ured.
Index mark_ _ _ _ _ _ _ _ _ __ When set in line with the
Function
Controls and indicators
index pin, indicates that
the front of the anemom-
Start-stop pushbutton _ _ _ _ _ _ _ _ _ Starts and stops the move-
eter is perpendicular to
ment of the second and
the direction of the wind-
minute hands.
flow.
Returns the second hand to
Return to zero push-
Zero-adjust screw _ _ _ _ _ _ Sets pointer of dial to zero.
zero.
button.
Windspeed scale _ _ _ _ _ _ _ _ Indicates windspeed from 0
Spring winding knob _ _ _ _ _ _ _ Winds the mainspring of
to 40 knots per hour
the timer.
(ML-433A/PM), or 0 to
Controls the accuracy of
Speed regulator cover-
40 mph (ML-497/PM).
the timer.
plate.
Dial _ _ _ _ _ _ _ _ _ __ _ _ Records elapsed time since
the timer was started in
minutes (minute hand)
Function
Control or indicator
and seconds (second
I
hand).
Dial calibration.
Slotted screw (ML-
102-B, -E or F only).
3-2. Preliminary Operating Procedures
Dial (fig. 1-9 and 1-10) _- Indicates atmospheric pres-
sure in millibars (ML-
a. Balloon Launching Site (Visual Observa-
102-B, -D, -E, F, or
tion).
-G) and inches of mer-
(1) Perform preliminary procedures (lev-
cury (ML-102-B, E, or
-F).
eling and orienting) on the theodo-
lite set. Refer to TM 11-6675-200-
c. Plotting Board. The only control on the
10 for detailed instructions.
plotting board is the retractable pin adjust-
(2) Select the proper pilot balloon for use
ment, which allows the retractable pin to be
in the visual observation; use the fol-
raised and lowered when needed.
lowing criteria:
(a) Uncolored pilot balloons are used
d. Radiosonde Set. Refer to TM 116660-
when the sky is clear or lightly
22810 for information concerning the con-
obscured due to fog, haze, or
trols of the radiosonde set.
AGO 8029A
3-1
Change 8
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