Optical a nd ,•olllmC'tric relaxation s in glass we re st udied after compress ing specimens .fhours at \),000 atmospheres and 21 0 C. Following re l ea~e of pressure t he refractiv e index waR hi gher tha n the o ri gin a l val ue a nd decreased with ti m e, re covering its ini tia l valu e wiLhin 12 hour~.Optical-relaxation cun•es for lead and borosilicate glasses ,\•e re complcx, the dcLailed behavior depend in g on composition and the r mal histo ry.No corresponding effects we rp obsel"\•ed in fURed silica after expo~ure to even higher pressures.Volumetric cllanges associated wit h index changes were dC'lermi ned i nterfcrometricall.v and fOll nd to be less than correspo ndin g changp, known to [lccompall!• annpaling.Pos~ible implicat ions of the results are d iscllssc'd.
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Weir et al. (1957) studied this question.