The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Aeroplanes and Dirigibles of War by Frederick A. Talbot: officer, which intimates to the airman that his signal has been
observed and that the range has been taken.
In observing the effects of artillery fire a code of signals is
employed between the airman and the artillery officer to indicate
whether the shot is "long" or "short," to the right or to the
left of the mark, while others intimate whether the fuse is
correctly timed or otherwise. It is necessary to change the code
fairly frequently, not only lest it should fall into the enemy's
hands, but also to baffle the hostile forces; otherwise, after a
little experience, the latter would be able to divine the
significance of the signals, and, in anticipation of being
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