Glossary, ContinuedA (Continued)AMERICAN STANDARDS ASSOCIATION—Also called ASA. See ISOor EXPOSURE INDEX.ANTIQUE STOCK—A rough-surfaced paper, such as wove or laid.APERTURE—An opening behind the lens that allows exposure to one frameof film.APPLICATION BLOCK—The part of a drawing of a subassembly,showing the reference number for the drawing of the assembly or adjacentsubassembly.ARC—A portion of a curved line.ARC LAMP—A light source resulting from the application of current to twocarbon electrodes that form an electric arc.ARCHITECT’S SCALE—A scale used when dimensions or measurementsrepresent feet and inches.AREA (PICTURE)—The flat surface within the border of a picture.ARROWHEAD—An indicator shaped like an elongated triangle used at theend of a lead line to direct attention to an object or a point of reference.ART—Any copy other than text; any photograph, painting, or drawing inline, halftone, or continuous tone.ART BRUSHES—See BRUSHES.ART GUM—A soft, grit-free eraser used to clean drawings and removeunwanted pencil lines.ARTIST’S BOARD—See ILLUSTRATION BOARD.ARTWORK—Illustrations, drawings, photographs, renderings, paintings,sketches, and copy.Continued on next pageAI-3
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