Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 167
ne, but this is not always the case.For rectangular objects, such as prisms, cubes, etc., the baseedges arc at 30° only when the prism or cube is sujiposcd to be inthe simplest x^ossible position. The cube in Fig. 46 is supix)sid tobe in the ixjsition indicated by plan and elevation in Fig. 47,… … 130 MECHANICAL DRAWING 39 would these edges appear in their true lengths. It follows, then,that in isometrical 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…
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