Foucault Pendulum - 6 Ft
To demonstrate that the earth rotates.
Foucault pendulum with support and special protractor, as photographed.
This is a real six-foot Foucault pendulum with an alignment ring such that it will oscillate for over one hour. It rotates at the 9.5 degree per hour rate for the latitude of Washington, D.C., so in one class period its rotation can be readily observed. ◙
R. Stuart Mackay, Sustained Foucault Pendulums, AJP 21, 260-266 (1953). Geoffrey I. Opat, The precession of a Foucault pendulum viewed as a beat phenomenon of a conical pendulum subject to a Coriolis force, AJP 59, 822-823 (1991). H. Richard Crane, Foucault pendulum "wall clock," AJP 63, 33-39 (1995). John E. Horne, Apparatus for Teaching Physics: Classroom Foucault Pendulum, TPT 34, 238-239 (1996).