Evans balance

An Evans balance, also known as a Johnson-Matthey balance (after the most prolific producer of the Evans balance) is a device for measuring magnetic susceptibility.wikipedia
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Magnetic susceptibility

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An Evans balance, also known as a Johnson-Matthey balance (after the most prolific producer of the Evans balance) is a device for measuring magnetic susceptibility.
This system, widely used today, is called the Evans balance.

Gouy balance

In the Gouy balance there is a homogeneous field in the central region between two (flat) poles of a permanent magnet, or an electromagnet.
Evans balance

Magnetic field

magnetic fieldsmagneticmagnetic flux density
Magnetic susceptibility is related to the force experienced by a substance in a magnetic field.

Analytical balance

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The force is measured by an analytical balance

Negative feedback

negative feedback loopnegative-feedbacknegative
A magnetic field is generated at the second magnet which, by negative feedback, restores the beam to its original position.

Dennis F. Evans

The original Evans balance was described by Dennis F. Evans in 1973 based on a torsional balance developed in 1937 by Alexander Rankine.

Diamagnetism

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The reading for the empty tube is needed because the tube glass is diamagnetic.

Magnetochemistry

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The Evans balance. is a torsion balance which uses a sample in a fixed position and a variable secondary magnet to bring the magnets back to their initial position. It, too, is calibrated against HgCo(NCS) 4.