Orthographic Projection(redirected from First-angle projection)
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Related to First-angle projection: Engineering drawing
orthographic projection[¦ȯr·thə¦graf·ik prə′jek·shən]
A projection for displaying the poles of a crystal in which the poles are projected from a reference sphere onto an equatorial plane by dropping perpendiculars from the poles to the plane.
A perspective azimuthal projection of one hemisphere produced by straight parallel lines from any point desired from an infinite distance; it is true to scale at the center only.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A method of projection in which a three-dimensional object is represented by projecting lines perpendicular to a picture plane. See also: Projection drawing
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a perspective cartographic projection. Because of considerable distortions, it is not used in cartography.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
Projection in which exact views of an object are constructed by extending perpendiculars from points on the object to the plane of projection.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.