Glass: A Pocket Dictionary Of Terms Commonly Used - Corning ...

includes traces of iron found in the silica used as the
major ingredient. such glass is inexpensive to produce,
and it is used for such items as bottles, when good quality
is not essential. sometimes, additional iron, in the
form of iron oxide (or other materials), is employed to
darken the color.
Bow lathe: A primitive lathe powered by the use of a
bow. The bowstring is looped around the spindle of
the lathe and causes it to rotate as the bow is drawn
backward and forward.
Bowl: (1) A rounded, hollow vessel; (2) the uppermost
part of a goblet, tazza, or wineglass.
Breakfast set: A sugar bowl and matching creamer.
Brilliant-cut glass: objects with elaborate, deeply cut
patterns that usually cover the entire surface and are
highly polished. in the United states, the vogue for
brilliant-cut glass lasted from about 1880 to 1915.
Broad glass: See Cylinder glass.
Broken-swirl ribbing: Mold-blown decoration that has
two sets of ribs. This is made by blowing the gather in
a vertically ribbed dip mold, extracting and twisting it
to produce a swirled effect, and then redipping it in the
same or another dip mold to create a second set of ribs.
Bubble: A pocket of gas trapped in glass during manufacture.
The term is used both for bubbles introduced
intentionally (known as air traps or beads) and for unwanted
bubbles created during the melting process.
very small bubbles are known as seeds. See also Pulegoso.
Bull’s-eye pane: A glass pane with a pontil mark surrounded
by concentric ridges. This was the central part
of a large pane of crown glass.
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