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Equipment
EFM-100 v.2
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C
H
A
P
T
E
R
4
-
O
P
E
R
A
T
I
O
N
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Fi
gur
e
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:
T
h
un
de
rc
lo
ud
D
ir
e
ct
ly
Ov
er
he
ad
Fi
gur
e
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:
E
l
e
c
tri
c
Fi
el
d
Po
la
r
i
ty
Re
ve
rs
a
l
With the thundercloud directly overhead the pola
rity of the field has reversed
to a negative electric
field.
1
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