Hughes-Drever experiment

== English == === Etymology === Named after Vernon W. Hughes and Ronald Drever, who independently conducted experiments of this kind in the early 1960s. === Noun === Hughes-Drever experiment (plural Hughes-Drever experiments) (physics) Any of various spectroscopic tests of the isotropy of mass and space, originally to test Mach's principle and now understood to be important tests of Lorentz invariance.