astatic
/əˈstatɪk
/adjective Physics
(Of a system or instrument) consisting of or employing a combination of magnets suspended in a uniform magnetic field on a single wire or thread in such a way that no torque is present.Sensitivity is enhanced by use of multiple-spring astatic systems, which are more vulnerable than single springs to breakage or simple tangling.
Origin
Early 19th century: from Greek astatos 'unstable' + -ic.