Group of 10 stereoviews depicting early military observation balloons and dirigibles. The views show balloons being inflated, tethered, and launched while surrounded by soldiers, ground crews, and spectators. Several scenes capture dirigibles and observation balloons in flight, while others document the preparation of the aircraft on open fields.

The stereoviews include examples published by Keystone View Company and Underwood & Underwood along with other stereoscopic publishers active in the late nineteenth and early twentieth centuries. Subjects appear to include military balloon demonstrations and wartime observation balloons used for aerial reconnaissance.

These images illustrate an important transitional period in the history of aviation when balloons were used extensively for military observation prior to the widespread use of airplanes. The lot presents a varied group of stereoviews documenting early aeronautical technology and balloon operations.