Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 258
the required shadow. 94. Problem XXVI!.To construct the shad=ow on the intrados of acircular arch in section,the plane of the archbeing in profile projec=tion. Let AB (Fig. 4S) 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 48 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 DO and MN. A similar construction is used in the case of a hollow semi-cylinder when its axis is vertical, except, that…
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