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Astronaut Conrad conducts a human vestibular function experiment

(March 1,1973) Astronaut Charles Conrad Jr (1930-1999), commander of the first manned Skylab mission, serves as a subject in Human Vestibular Function Experiment M131 during Skylab training at Johnson Space Center. Conrad is in the work-and-experiments compartment of the crew quarters of the Skylab Orbital Workshop (OWS) trainer at Johnson Space Center in Houston. The reference sphere with a magnetic rod is used by the astronaut to indicate body orientation non-visually. The "litter chair" in which he is seated can be rotated by a motor at its base or, when not being rotated, can tilt forward, backward, or to either side. (Source: NASA/Johnson Space Center [Houston]. NASA ID: S73-20695. Public domain.)