For instance, A sends his airmen aloft and
conversation begins between the clouds and the ground. Presently
the receivers of B begin to record faint signals. They fluctuate
in intensity, but within a few seconds B gathers that an
aeroplane is aloft and communicating with its base. By the aid
of the field telephone B gets into touch with his whole string of
wireless stations and orders a keen look-out and a listening ear
to ascertain whether they have heard the same signals. Some
report that the signals are quite distinct and growing louder,
while others declare that the signals are growing fainter and
intermittent. In this manner B is able to deduce in which
direction the aeroplane is flying. Thus if those to the east
report that signals are growing stronger, while the stations on
the west state that they are diminishing, it is obvious that the
aeroplane is flying west to east, and vice versa when the west
hears more plainly at the expense of the east. If, however, both
should report that signals are growing stronger, then it is
obvious that the aircraft is advancing directly towards them.
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