The Foucault Pendulum

The Foucault pendulum in MHT hung from the ceiling of the third level and stretched 71 feet through the center of the building; swinging slowly and silently just above the floor of the first level.

It was a striking display and MHT was often identified as “the museum with the pendulum,” an association the museum encouraged. The fact that it was also a science demonstration set just the right tone for the new museum’s approach to history.

But as it evolved, and particularly after the change to NMAH, the museum moved away from science-based exhibits and the pendulum’s prominence became increasingly difficult to justify. Although still popular with visitors, in 1998 it was finally removed. The decision was justified primarily by the practical need to create more space for exhibits and special events, but many also saw it as a necessary step in the full conversion of MHT to NMAH.

Brochure explaining how the Foucault Pendulum shows the rotation of the Earth. Tens of thousands of these brochures were given to visiting school groups.

The pendulum in motion.