Torsion Pendulnm of Long Period

Abstract

A torsion pcndulum of long period is made and shown in Figs l, 2 and Photos 1, 2. A rotor rotates around a verticalaxis, and the case of the rotor is filled with oil. Therefore the weight of the rotor is supported by the buoyancy of the oil, and the load of pivot bearings becomes very small. Total size of the pendulum is 88φ×69mm, and the calculated period is 42 seconds. It's Characteristics is shown in Figs 5 and 6.