Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 263
^,the required shadow. 94. Problem XXVII.To construct the shad=ow on the intrados of acircular arch in section,the plane of the archbeing in profile projecttion. Let AB (Fig. 48) be the springing line of the arch. Let CD be the radius of the curve. The point F is determined by the construction used… … 212 SHADES AND SHADOWS 43 FIG-50 the line of shadow will be tangent to these two lines at the pointsF and B. The required shadow is that portion of the curve be-tween the lines DC and MN. A similar construction is used in the case of a hollow semi-cylinder when its axis is vertical, except, that…
Architecture · Building
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