This device contains gyroscopes, accelerometers, and other equipment to provide a "stable platform" for the Apollo 15 Command Module. A stable platform is a reference point, from which the astronauts could perform calculations for navigation, guidance, and control from Earth orbit to the Moon and back.
Apollo 15, crewed by astronauts Dave Scott, Al Worden, and James Irwin, was the fourth Apollo mission to the lunar surface, in July, 1971.
Transferred from NASA to the Museum in 1977.
Transferred from National Aeronautics and Space Administration