OrthographicProjectionsIntroductionThe second major classification of parallel projections is orthographicprojections.OrthographicOrthographic projections are drawings where the projectors originating fromprojectionsthe observer or station point remain parallel to each other and perpendicularto the plane of projection. For accurate and scientifically correctpresentations of objects, piping diagrams, machine, structural, architecturaldrawings, and furniture design that can be sufficiently understood andreplicated by a craftsperson, use a form of orthographic projection.Orthographic projections are commonly referred to as blueprints because themethod of reproduction, usually by the diazo process, renders the image witha blue line. Orthographic projections are further subdivided into axonometricprojections and multiview projections.Figure 6-12 shows an example of an orthographic projection.Figure 6-12.—An orthographic projection.Continued on next page6-15
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