Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 130
oints 98 MECHANICAL DRAWING 79 which are shown in plan directly beneath on the circle x, and arepoints on the required intersection. Planes y and z, and as manymore as may be necessary to determine the curve accurately, areused in the same way. The curve found is an ellipse. The studentwill readily… … Fig. 129. Parabola—Section from a Coneplace its plane in a position parallel either to the vertical or to thehorizontal. The actual length of the long diameter of the ellipsemust be shown in elevation, c cr, because the line is parallel to thevertical plane. The plane of the ellipse then may be…
Architecture · Building
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