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

Cone beaker: A drinking vessel in the form of an inverted
cone. Cone beakers were used in several cultures,
including ancient rome, sasanian iran, and early medieval
Europe.
Copper-wheel engraved
medallion. Bohemia,
Dominik Biemann, 1834.
D. 9.5 cm.
Copper-wheel engraving: A technique of decorating
the surface of an object. Copper disks (wheels) of various
sizes and rim profiles are rotated on a spindle. An
abrasive such as Carborundum (in the past, emery was
frequently used), mixed with oil, is applied to the edge
of the wheel. The wheel presses the abrasive against
the glass so that it removes the surface by grinding.
Cord: A part of the glass that differs in composition
from the surrounding matrix. This difference produces
a change in the refractive index, which enables the
cord to be seen as a streak and so spoils the appearance
of the glass.
Core: The form to which molten glass is applied in order
to make a core-formed vessel. in pre-roman times,
the core is thought to have been made of animal dung
mixed with clay.
Core forming: The technique of forming a vessel by
winding or gathering molten glass around a core sup-
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