anges in t he refractivity of several glasses caused by a nnealing at different temperatu res a re presented . T he result s are gi ven in t he fo rm of eq uilibrium temperature coefficients, as t h e g las es were a nn ealed at eac h a nnealing tem per at ure until t here was no further ch a nge i n t h e re fractivity or de nsity. T h e measurements on refracth 'ity a nd den sity were made at standard atm ospheri c temperat ures ince the changes in t hese propert ies at such temperat ures have a greater practical s igni fican ce t han t he corresponding changes at tempe['atures within t he anneali ng range.
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Tool et al. (1947) studied this question.