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torsion balance

Definitions

  • WordNet 3.6
    • n torsion balance measuring instrument designed to measure small forces by the torsion they exert on a thin wire
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Webster's Revised Unabridged Dictionary
    • Torsion balance (Physics) an instrument for estimating very minute forces, as electric or magnetic attractions and repulsions, by the torsion of a very slender wire or fiber having at its lower extremity a horizontal bar or needle, upon which the forces act.
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Usage

In literature:

It is mainly a torsion balance combined with a Leyden-jar.
"A Treatise on Meteorological Instruments" by Henry Negretti
The torsion balance was enclosed in a case and outside this two lead spheres WW each 12 in.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 4" by Various
This was found to upset the balance, the resultant torsion being anti-clockwise.
"Life Movements in Plants, Volume II, 1919" by Sir Jagadis Chunder Bose
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In science:

Merkowitz, Measurement of newton’s constant using a torsion balance with angular acceleration feedback, Phys.
New Regions for a Chameleon to Hide
The microgravity conditions also allow for an improved design of the null experiment, free from the geometric constraints of the torsion balance.
Experimental Tests of General Relativity
Torsion Balance Investigation of the Finite Temperature Casimir Force.
Precision studies of Casimir force and short-range gravity employing prototypes of interferometric gravitational wave detectors
Observation of Finite Temperature Casimir Effect in a Torsion Balance Experiment.
Precision studies of Casimir force and short-range gravity employing prototypes of interferometric gravitational wave detectors
To date, the highest precision, of order 10−12, has been achieved by torsion balance experiments, but the STEP experiment is designed to reach a precision of 10−18 .
Principles of Equivalence: Their Role in Gravitation Physics and Experiments that Test Them
We expect that, in the next year or so, our torsion-balance scheme for testing the gravitational 1/r2 law will provide good results for length scales down to 50 µm.
Sub-mm tests of the gravitational inverse-square law
Seismic noise is a limiting factor for many experiments on Earth (e.g. for gravitational wave detectors and for torsion balances) in the frequency range below 10 Hz. (7) For certain interactions, only in space one has the opportunity to search for the corresponding effects.
General Relativity in Space and Sensitive Tests of the Equivalence Principle
Tu, Z.-K. Hu, and E.-J. Luan, "New experimental limit on the photon rest mass with a rotating torsion balance", Phys.
Experimental test of magnetic photons
For ms as light as it could be (around 100 GeV), spin polarized torsion balances (see section 5.4) are able to place limits on M between 105 − 1010EP l .
Modern tests of Lorentz invariance
Spin polarized torsion balances are able to place comparable limits on the electron sector of the mSME .
Modern tests of Lorentz invariance
As the turntable rotates, since ˜b points in some fixed direction in space, the interaction produces a torque on the torsion balance.
Modern tests of Lorentz invariance
To conclude this section, we note that the torsion balance experiments are actually sensitive enough to also constrain the dimension 5 operators in (42).
Modern tests of Lorentz invariance
Heckel, B.R. (for the E¨ot-Wash Group), “Torsion Balance Tests of Spin Coupled Forces”, pro ject homepage, University of Washington.
Modern tests of Lorentz invariance
Hou, L., Ni, W., and Li, Y., “Test of Cosmic Spatial Isotropy for Polarized Electrons Using a Rotatable Torsion Balance”, Phys.
Modern tests of Lorentz invariance
In a torsion balance, two bodies of different composition are suspended at the ends of a rod that is supported by a fine wire or fibre.
Was Einstein Right? Testing Relativity at the Centenary
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