Four STS 61-A crewmembers with vestibular sled experiment

S85-43139 (20 Sept 1985) --- Four members of the STS 61-A/Spacelab D-1 crew and two technicians are shown with a vestibular sled experiment for they will use for extensive research and testing late October and early November are (background, left to right), Astronaut Bonnie J. Dunbar, Reinhard Furrer, Ernst Messerschmid and Guion S. Bluford Jr. The seat shown can be moved back and forth with precisley adjusted accelerations along the fixed rails on the floor of the Spacelab aisle.