The guns are disposed at the corners of the triangles as
indicated in Figs. 13-14. Taking the one triangle as an example,
the method of picking up the range may be explained as follows.
The several guns at the comers of the triangle, each of which can
be trained through the 360 degrees in the horizontal plane, are
in telephonic touch with an observer O stationed some distance
away. The airman A enters the area of the triangle. The
observer takes the range and communicates with the gunner B, who
fires his weapon. The shell bursts at 1 emitting a red flame and
smoke. The observer notes the altitude and relative position of
the explosion in regard to the aircraft, while gunner B himself
observes whether the shell has burst to the right or to the left
of the objective and corrects accordingly. The observer commands
C to fire, and another shell is launched which emits a yellow
flame and smoke. It bursts at 2 according to the observer, while
gunner C also notes whether it is to the right or to the left of
the target and corrects accordingly. Now gunner D receives the
command to fire and the shell which explodes at 3 throws off a
white flame and smoke.
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