Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 234
This has been done in Fitj. 25, in Avhich a^ is theshadow of the apex a. The ellipse Z^-^c^^/^^, etc., is the shadow ofthe base, found by assuming a sufficient number of points in theperimeter of the base and finding their shadows. The ellipsedrawn through these points of shadow is evidently the… … 192 SHADES AXD SHADOWS 23 FIG26 the shadows of the shade elements of the cone. It remains to de-termine these in the cone itself. Any point in the perimeter ofthe shadow of the base must have a corresponding point in theperimeter of the base of the cone, and this can be determined bvdrawing from…
Architecture · Building · Carpentry
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