Glossary, Continued
A (Continued)
AMERICAN STANDARDS ASSOCIATION—Also called ASA. See ISO
or EXPOSURE INDEX.
ANTIQUE STOCK—A rough-surfaced paper, such as wove or laid.
APERTURE—An opening behind the lens that allows exposure to one frame
of film.
APPLICATION BLOCK—The part of a drawing of a subassembly,
showing the reference number for the drawing of the assembly or adjacent
subassembly.
ARC—A portion of a curved line.
ARC LAMP—A light source resulting from the application of current to two
carbon electrodes that form an electric ‘arc.
ARCHITECT’S SCALE—A scale used when dimensions or measurements
represent feet and inches.
AREA (PICTURE)—The flat surface within the border of a picture.
ARROWHEAD—An indicator shaped like an elongated triangle used at the
end 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 in
line, halftone, or continuous tone.
ART BRUSHES—See BRUSHES.
ART GUM—A soft, grit-free eraser used to clean drawings and remove
unwanted pencil lines.
ARTIST’S BOARD—See ILLUSTRATION BOARD.
ARTWORK—Illustrations, drawings, photographs, renderings, paintings,
sketches, and copy.
Continued on next page
AI-3
