The sign accompanying the ST-80. It reads
Redstone Missile Gyroscope
On loan from the National Air & Space
in Washington, D.C.
Gyroscopes are fundamental for guiding missiles in flight. The inertia in
their spinning disks makes them resist changes in their attitude. By
connecting them to computers which move the missile's steering fins, gyroscopes
help keep rockets on course by alerting the computer to changes in direction.
This gyroscope is one of two from a Redstone missile and was built by Ford
Instrument Company of the Sperry-Rand Corporation.