Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 129
ole pyramid around, as the one line AC will be sufficient.The principle of finding the true length of lines is this, anucan be applied to any case : Swing one projection of the line par-allel to the ground line, using one end as center. On the otherprojection the moving end remains at the same… … 100 MECHANICAL DRAWING. 9 Third plane of projection or profile plane. A plane peipen-dicular to both co-ordinate planes, and hence to the ground line, is
Architecture · Building · Carpentry
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![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-16-12.webp)
