The country occupied by a belligerent is divided up in this
manner into a series of triangles. For instance, a machine
entering hostile territory from the east, enters the triangle
A-B-C, and consequently comes within the range of the guns posted
at the comers of the triangle. Directly he crosses the line B-C
and enters the adjacent triangle he passes beyond the range of
gun A but comes within the range of the gun posted at D, and
while within the triangular area is under fire from the guns
B-C-D. He turns and crosses the line A-C, but in so doing enters
another triangle A-C-E, and comes range of the gun posted at E.
The accompanying diagram represents an area of country divided up
into such triangle and the position of the guns, while the circle
round the latter indicate the training arc of the weapons, each
of which is a complete circle, in the horizontal plane. The
dotted line represents the aviator's line of flight, and it will
be seen that no matter how he twists and turns he is always
within the danger zone while flying over hostile territory. The
moment he outdistances one gun he comes within range of another.
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