Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 37
e measure-ments are given. In making vertical measurements in per-spective the following rule must be observed. All vertical distances on an object must be measured in per-spective on the line representing the front vertical edge of theobject. This is true for the following reasons : 32 MECHANICAL… … 4i- Fig. 22. Scale of Levels 2. In general, equal vertical distances are equal in perspectiveonly when measured on the same vertical edge. Example:AB = BK = KL. PERSPECTIVE SKETCHING 33
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![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-96-25.webp)
