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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: seen quite distinctly. Consequentiy, it was decided to employ
aerial craft as detectives. Both the aeroplane and the dirigible
took part in these experiments, being flown at varying heights,
while the submarine was maneouvred at different depths immediately
below. The sum of these investigations proved conclusively that
a submarine may be detected from aloft when moving at a depth of
from 30 to 40 feet. The outline of the submerged craft is
certainly somewhat blurred, but nevertheless it is sufficiently
distinct to enable its identity to be determined really against
the background or bottom of the sea. To combat this detection
from an aerial position it will be necessary inter alia to evolve
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