TM 75053
ML577/UM
Figure 65. Scale, Plotting ML577/UM.
1. NOMENCLATURE: Scale, Plotting ML177/UM.
6. TECHNICAL CHARACTERISTICS:
Type
________
Plastic, fluted cross section,
2. TYPE CLASSIFICATION: Standard A.
square shaped.
3. SECURITY REQUIREMENTS: Unclassified.
Graduations _ _ _ _ _ _ _ Outer edges 10 mil units of
4. PRIMARY USE OR CONCEPT OF EMPLOYMENT:
circular measure, num-
Used in plotting and computing windspeed and wind
bered 1 to 64, slit in face
rection.
of scale graduated in
5. BRIEF FUNCTIONAL DESCRIPTION:
knots of windspeed num-
Scale, Plotting ML577/UM is used as an aid in deter-
bered 1 to 30; 7-in. by
mining windspeed and wind direction, The ML577/UM
1/8-in. slit graduated in
is used with Plotting Board ML122 in the plotting and
knots of windspeed num-
computation of vectored zone winds and ballistic winds
bered 1 to 30; 8 each 9-
from meteorological data obtained by pilot balloons or
in. parallel lines spaced
radiosonde balloon tracking.
9/10 in. apart for orienta-
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