TM 11-6660-218-12
Figure 128, Pilot balloon nozzle.
ting station site (fig. 1-1). During electronic ob-
1-12. System Application
servations (fig. 12) .a rawin set is located in
When visual observations are performed at the
an area convenient for operation and a rawin set
met. station, the theodolite (fig. 1-3), the inflation
control and radiosonde recorder (not shown) are
device (fig. 1-19), the balloon inflation equipment
added to the plotting station site. If the location of
enemy fire is desired, sound-ranging techniques
sories are kept in the area called the balloon
are obtained through basic visual or electronic
observations. System techniques employed at the
met. station for the collection of the various types
chrometer (fig. 112), the telephone (fig. 116),
of meteorological data are given below:
the timer (fig. 120), and the wind plotting equip-
a. Visual Observation of Upper Winds. A 30-
ment (fig. 1-4) are kept in an area called the plot-
Change 8
1-36
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