National Mall
Explorer II Gondola
Explorer II lifted two Army Air Corps officers inside this sealed metal sphere to a record altitude of more than 22 kilometers. The gondola protected them while instruments studied the upper atmosphere. The gondola had to maintain a survivable atmosphere while supporting communications, photography, and scientific instruments. Balloon lift, pressure, temperature, mass, and recovery planning formed one connected system.
In depth
A pressure vessel made the stratosphere observable
Explorer II joined military aviation, National Geographic sponsorship, and scientific research in a public demonstration of stratospheric capability. Its pressurized cabin anticipated the environmental control problems of high-altitude aviation and spaceflight.
A life-support system with wings
As altitude increases, the environment that supports ordinary life becomes less forgiving. Lower pressure reduces the oxygen available to the body. Cold, decompression, and the consequences of an emergency demand specialized equipment. A pilot or balloonist therefore depends on a system that includes the cabin, clothing, oxygen supply, communications, and a means of returning safely.
High-altitude exploration developed through balloons as well as airplanes. Balloons could carry instruments above much of the atmosphere, while aircraft offered different combinations of speed, control, and range. Pressure garments and enclosed gondolas turned the occupant's immediate surroundings into a small protected environment. The same broad problems later followed people into space.
These objects also reveal the limits of celebrating altitude as a number alone. A record flight had to preserve its observations and bring its crew home. A reconnaissance mission had to support useful photography and dependable navigation over a long route. The suit, instrument, or engine in a display case may look secondary to the famous aircraft, but it made the mission possible. Comparing balloon equipment, high-altitude aircraft, and spacecraft connects a century of efforts to keep people functioning where an unprotected body could not survive.
