Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 168
drawing, true lengths appear oidy as 30° linesor as vertical lines. Edges or lines that in actual j)rojection areeither parallel to the ground line or perpendicular to V, are drawnin isometric as 30° lines, full length; and those that are actuallyvertical are made vertical in isometric, also full…
Architecture · Building · Carpentry
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