Society of Glass Technology · [Sheffield] · leaf 293
ulation of air between the two. Boththe inner and the outer brass tubes carried attached pieces of glassplate placed in juxtaposition, each bearing a fine scratch. Anyrelative movement of the scratches could be observed and measured.Relative displacement would be due to the difference of… … FlG. 1 sion, and so not affect the readings. The distance between the markson the two glasses was measured at different temperatures by meansof a microscope fitted with a micrometer eyepiece. One division ofthe scale of the micrometer eyepiece corresponded with 1114x10mm. Temperatures were observed…
Glass
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