Object Details
- Creator
- Harrell, Alfred
- Subject
- Smithsonian Institution Office of Printing and Photographic Services
- National Museum of History and Technology
- Summary
- On exhibition January 1, 1964 - October 30, 1998.
- Modeled after French physicist J. B. L. Foucault's 1851 pendulum, the museum's pendulum demonstrates the axial rotation of the earth. The 240-pound brass, hollow bob is suspended by a 54-ft. steel cable from the ceiling of the 4th floor. Although the pendulum's vertical plane seems to change, in fact it remains fixed. What is actually moving is the floor, which rotates under the pendulum because of the Earth's rotation. As the Earth moves, the red markers, arranged in a circle around an inlaid compass rose, move into the path of the pendulum, and the bob knocks them over one by one.
- Cite as
- Smithsonian Institution Archives, Acc. 11-009, Image No. 75-3965
- Repository Loc.
- Smithsonian Institution Archives Capital Gallery, Suite 3000, MRC 507; 600 Maryland Avenue, SW; Washington, DC 20024-2520
- 1975
- March 13, 1975
- Local number
- SIA Acc. 11-009 [75-3965]
- Restrictions & Rights
- No access restrictions Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at osiaref@si.edu
- No Copyright - United States
- Type
- Color negatives
- Physical description
- 4 x 5;
- Smithsonian Institution Archives
- Topic
- Exhibitions
- Foucault's pendulum
- Record ID
- siris_arc_398143
