The Examination of Optical Glass in Relation to Weathering Properties
T052-T069 (18 pages)
It is claimed that the "dimming" test described above gives valuable information in a comparatively short time as to the durability of glass towards atmospheric attack. It is proposed to continue this work and to attempt to establish a relation between the chemical composition of a glass and its durability. The described dimming tests have been carried out at 80°, but a number of experiments indicate that a lower temperature, or a shorter time of test, may enable sharper discrimination to be drawn between different glasses.
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