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Jack
(glass) A metal tool used in the forming of glass. |
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Jack Loom
(fiber) A floor loom in which each shaft operates independently. The shafts rise when the treadles are depressed. Also called a rising-shed loom. |
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Jacquard
(fiber) Intricate woven-in patterns created using a special loom; a raised design or pattern woven into the fabric as opposed to being printed on the fabric. |
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Jade Crystal
(glass) Term applied to trophy blanks and sculptural blanks made of regular plate glass, which has a green tint at the edge of the glass |
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Japanese Alloys
(metal) A general term for alloys widely used in Japan, such as shibuishi, kuromido and shakudo. These copper-based alloys are especially favored for their ability to take striking patina colors. |
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Jasper
An opaque variety of quartz, reddish, brown, green, or yellow in color, used for ornamentation or as a gemstone. |
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Jatoba Wood
(wood) A reddish wood that is known for its extreme density. Native to Central and South America. |
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Jig Saw
(wood) A narrow saw mounted vertically in a frame for cutting curves or other difficult lines. |
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Jiggering
(ceramics) A method of creating pottery. A slab of soft clay is placed upon a revolving plaster mold of the object to be formed. The mold forms what will be the inside/top of the piece. As the wheel head turns, a metal template on a moving arm trims off the excess clay and forms the bottom of the piece. The pieces are then all finished by hand. Jiggering is also known as jollying. |
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