Society of Glass Technology · [Sheffield] · leaf 658
a circular row of perforations in which the pins are inserted. Thusthe metal is pressed into a cylinder composed of prisms united by athin fin or web of glass, which is broken away, the rough edges ofthe prisms being afterwards ground. In a modification, shown insection in Fig. 171, a two-part…
Glass
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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