To use Figure 1-4, place a hairline through the point on the right-hand
scale representing distance-to-ground zero or flash-to-bang time and through
a point on the center scale representing either the cloud-top angle
measurement or the cloud-bottom angle measurement.
At the point of
intersection of the hairline and the left-hand scale, read the yield. If a
cloud-top angle measurement is used on the center scale, read the yield on
the right side of the left hand scale entitled "Yield (Cloud Top)." If a
cloud-bottom angle measurement is used, read the yield on the left side of
the left-hand scale entitled "Yield (Cloud Bottom)." For example, an
observer reports a flash-to-bang time of 120 seconds, angle to cloud top of
300 mils, and angle to cloud bottom of 200 mils. Place a hairline from 120
seconds on the flash-to-bang time scale through 300 mils on the left side of
the angle scale; the yield is read as 60 KT on the right side (cloud top) of
the yield scale.
Place a hairline from 120 seconds on the flash-to-bang
time scale through 200 mils on the left side of the angle scale; the yield
is read as 60 KT on the left side (cloud bottom) of the yield scale.
CM5206
1-8
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