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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: with a detonating head. This is dropped overboard. When it
strikes the ground the detonator fires a charge which emits a
report without damaging the message container, and at the same
time fires a combustible charge emitting considerable smoke. The
noise attracts anyone in the vicinity of the spot where the
message has fallen, while at the same time the clouds of smoke
guide one to the point and enable the cylinder to be recovered.
This device is extensively used by the German aviators, and has
proved highly serviceable; a similar contrivance is adopted by
French airmen.
There is one phase of aerial activity which remains to be
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