Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 73
wing it is essentialthat the top view always be placed directly above the front view. 68 MECHANICAL DRAWING Under this condition all distances from left to right may beprojected from one view to the other. ^Beading the Drawing. To form a mental image of anobject the relation of its surfaces, edges,… … Fig. 68. Type Problem. Constructive Stage of the Okthogkaphic Sketch Plane Surfaces. Fig. 69 represents an object having planesurfaces. 1. When the observer is looking perpendicularly at a surfaceit appears in its true form and proportion. Example: Therectangular top surface A B C D of the bench…
Mechanical drawing
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![An illustration from M. Vitrvvii viri svae professionis pertissimi De architectvra libri decem, ad Avgvstum Cæsarem accuratiss. conscripsit & nvnc primvm in Germania qva potuit diligentia excusi, atq[ue] hinc inde schematibus non iniucundis exornati (1543)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviivirisva00vitr-141-49.webp)
