National Geographic : 1936 Jan
Photograph by Master Sergeant G.B.Gilbert and Captain H.K.Baisley THE "EXPLORER II," GAINING ALTITUDE RAPIDLY, IS ABOUT TO SAY GOODBYE TO THESNOW-PATCHED BLACK HILLS In this photograph from an accompanying Army plane, the big bag floats southeast near the edge of the forested BlackHills. Shortly afterward itswung over theplains. Hoarfrost on the fabric and rigging glistened in the early morning sunlight. Later this frost evaporated andfreed theballoon ofconsiderable weight.