Observation Balloons
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Inflating a "French Sausage" observation balloon. (OSA, Oregon State Defense Council Records, World War I Photographs)(OSA, Oregon State Defense Council Records, World War I Photographs)
Moving an observation balloon using tether lines. (OSA, Oregon State Defense Council Records, World War I Photographs)
An observation balloon ascends on a mission to assess enemy strengths and movements. Notice the grave markers in the foreground. (OSA, Oregon State Defense Council Records, World War I Photographs)