Group of 8 stereoviews showing the preparation and inflation of a large military observation balloon. The views depict crews attaching ropes and equipment, sandbags being handled near the balloon basket, and the balloon gradually filling while workers and spectators gather around the field.

Published by the Keystone View Company with Medallion series mounts, the stereographs document several stages of the balloon inflation process including the valve area, attachment of cables, and the balloon nearing full inflation. One view shows a group assembled in front of a large American flag identified as descendants of the Washington family at a dedication ceremony for Washington Air Junction.

These images illustrate the practical operations surrounding early observation balloon work and the public events that accompanied early aeronautical demonstrations. The photographs form a cohesive visual sequence showing the technical process of preparing a large tethered balloon for ascension.