Manual
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Boltek Manuals
Equipment
EFM-100 v.1
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C
H
A
P
T
E
R
4
-
O
P
E
R
A
T
I
O
N
36
Fi
gur
e
32
:
T
h
un
de
rc
lo
ud
D
ir
e
ct
ly
Ov
er
he
ad
Fi
gur
e
33
:
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 electri
c
field.
1
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