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The Stratospheric Space Suit was a pressurized suit designed by Colonel Emilio Herrera Linares in 1935 to be worn during a stratospheric flight using an outdoor hot air balloon scheduled for the following year. It is considered one of the antecedents of the spacesuit.
The flight never took place due to the start of the Spanish Civil War. Herrera, a member of the Republican side, fled to France in 1939, where he died in exile in 1967. The suit, made of vulcanized silk, was cut and used to make raincoats for the troops. It would have been the first fully pressurized functional suit in history, although it was never worn in real conditions.
The suit had a hermetic cover on the inside (tested in the bathroom of Herrera's apartment in Seville), covered with an articulated metal frame with accordion-like folds. It had articulated parts for the shoulders, hips, elbows, knees, and fingers. The mobility of the suit was tested at the Cuatro Vientos experimental station, and according to Herrera it was "satisfactory". The suit was supplied with pure oxygen. Herrera designed a special carbon-free microphone to use inside the suit and avoid any possibility of spontaneous ignition. The helmet visor used three layers of glass: one unbreakable, one with an ultraviolet filter, and an opaque infrared exterior. All three layers had an anti-fog treatment.
Herrera included an electric heater in the suit, but during tests in a chamber simulating high altitudes it turned out that the suit was heated to 33 ° C while the temperature of the atmosphere around it dropped to -79 ° C. Herrera soon He realized that the problem with a pressurized suit in a near-vacuum environment was actually removing excess heat produced by the human body.