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Figure 1.2 - Form the theoretical and the actual curves of
imaginary resistance

l min l
max
H  H   ; H  H   , (1.8)
base cgp roof cgp
2 2
or
l l
H  H  min  ; H  H  max  , (1.9)
base igp roof igp
2 2
then:
h  H  max  H  max  l  H  max      HHH  min   min   max , (1.10)
cgp igp cgp igp igp igp

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