torsion pendulum

torsion pendulum

[′tȯr·shən ′pen·jə·ləm]
(mechanics)
References in periodicals archive ?
Second, the balloon rose in a spiral that twisted the support straps, which in turn caused the 2,500-pound gondola to revolve like a giant torsion pendulum throughout the entire 12-hour flight.
1970 solar eclipse as "seen" by a torsion pendulum. Physical Review D, v.
A propellant-less microwave thruster built by Guido Fetta, presented on July 30 showed positive results and have been published in a paper called "Anomalous Thrust Production from an RF [radio frequency] Test Device Measured on a Low-Thrust Torsion Pendulum".
Ted Cook of the University of Washington in Seattle and colleagues used a torsion pendulum to probe how gravity works at small scales, if the force's strength differs from expected when objects are very close, it could indicate that gravity leaks into extra dimensions.
In this well-illustrated treatment of the study of pendulum, Baker (Bryn Athyn College of the New Church) and Blackburn (Wilfrid Laurier U.) provide fascinating information about the history of the pendulum and what scientists thought it did, the revolution wrought by Foucault, the special cases of the torsion pendulum, the chaotic pendulum, the quantum pendulum, and coupled pendulums, the effects of superconductivity, and the most familiar to most of us, the pendulum clock.
Using other instruments such as a high pressure gas dilatometry apparatus, a tensile tester, a pressure-volume-temperature apparatus, a thermomechanical analyzer, and a torsion pendulum, the 7 other orthotropic constants and the 3 coefficients of thermal expansion are determined.
Gillham received this recognition for the development of the first commercially available automated dynamic mechanical analyzer--a freely oscillating torsion pendulum. This led the way for other commercial DMA instruments.
The compilation shows that an influence of the crosslinking system is observed only in the TR test according to ISO 2921 and that differences in crosslink density are not reflected by the results of any other test method used, such as ISO 2856 for the glass transition temperature testing, the torsion pendulum test according to ISO 4663, the Gehman test (ISO 1432) or the brittleness point test (ISO 812).
Among the methods described there are: a torsion balance where the gravitational torque is balanced by an electrostatic torque produced by an electrometer; a torsion-strip balance where the fibre is substituted by a strip; a dynamic method based on a rotating torsion pendulum with angular acceleration feedback; a free fall method where the determination of G depends on changes in acceleration of the falling object, etc.
One of the most frustrating limitations in measuring G is imposed by "gravitational noise." For example, suppose a truck pulls into a parking lot outside the laboratory where a sensitive torsion pendulum is located.