43 ATTENTION ! les points obtenus a, b, c,d pour avoir le carré en perpective. … lignes AC et BC représentera la hauteur AB plus ou moins éloignée. On a ainsi une échelle
Design · Painting
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Brief synopsis of the course of lectures in descriptive geometry; as arranged for the first year Faculty of Applied Science and Engineering, University of Toronto. [By] J. Roy Cockburn (1922)](https://img.insideoutlibrary.com/img/200/ia-fybriefsynopsiso00cockuoft-23-19.webp)
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