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| Polyhedron |
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In geometry, a solid bounded by flat surfaces
with each surface bounded by straight sides. Each of the
flat surfaces is called a face.
A convex polyhedron is one in which a line segment connecting
any two vertices of the polyhedron contains only points
that are on a face or inside the polyhedron. Otherwise,
it is called concave.
In a regular polyhedron all of the faces are regular polygons
that are congruent (equal in size and shape). |
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| Pontil |
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The pontil, or punty, is a solid metal
rod that is usually tipped with a wad of hot glass, then
applied to the base of a vessel to hold it during manufacture.
It often leaves an irregular or ring-shaped scar on the
base when removed. This is called the "pontil mark." |
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| Porcelain |
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A hard, white, translucent ceramic made
by firing kaolin, quartz and feldspar. |
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| Potash Glass |
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Potash is used as fusion agent in the
making of this type of glass. Potash is obtained by leaching
wood ashes, evaporating the lye, and calcinating the residue. |
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| Pottery |
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Clay craftsmanship |
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| Precious Stone
Engraving |
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Engraving on glass surface by the use
of wheels and abrasives, such as abrasive wheel, silicon
carbide powder, diamond powder, pumice powder. |
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| Pressed Glass |
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Semi-automatic fabrication by using several
metalic moulds and a press machine. Glassware formed by
placing a blob of molten glass in a metal mould, then
pressing it with a metal plunger or "follower"
to form the inside shape. The resultant piece, termed
"mould-pressed," has an interior form independent
of the exterior, in contrast to mould-blown glass, whose
interior corresponds to the outer form. The process of
pressing glass was first mechanized in the United States
between 1820 and 1830. |
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