Battle in the Air: French Airmen Attacking a German Observation Balloon

For code signals a glittering disk suspended by a wire a number of feet below the air craft is used. By swinging this disk, the airman can signal as though it were a flag, using the dot-and-dash”wigwag” code.  The German observation balloons, derisively called “sausages” by the allies because of their peculiar shape, use this code”

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