In these circumstances the difficulties of ethereal
communication 'twixt air and earth may be realised under the
present limitations of radius from which it is possible to
transmit.
But there are reasons still more cogent to explain why wireless
telegraphy has not been used upon a more extensive scale during
the present campaign. Wireless communication is not secretive.
In other words, its messages may be picked up by friend and foe
alike with equal facility. True, the messages are sent in code,
which may be unintelligible to the enemy. In this event the
opponent endeavours to render the communications undecipherable
to one and all by what is known as "jambing." That is to say, he
sends out an aimless string of signals for the purpose of
confusing senders and receivers, and this is continued without
cessation and at a rapid rate. The result is that messages
become blurred and undecipherable.
But there is another danger attending the use of wireless upon
the battlefield. The fact that the stations are of limited range
is well known to the opposing forces, and they are equally well
aware of the fact that aerial craft cannot communicate over long
distances.
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