CIVA
Delco Carousel IV-A Inertial Navigation System. aka "CIVA".
It was a common inertial navigation system used before adoption of GPS in the 1990's.
CIVA was found on Boeing 707, 727, some 737-100s and -200s, the DC-10, L-1011 Tristar, and on the early 747-100, -200 and -300 variants.