Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, Comstock · leaf 313
ut ample abutments unless beams areplaced above the arch as described in Article 288. The joints of an elliptical arch should be exactly normal (at rightangles) to the curve of the soffit. If the line of the soffit is not a trueellipse, but is made up of circular arcs of different radii, the… … N7 Ne Na N4, Ne N2 Ni Fig. 140.—Method of Laying Out Joints of Killiptical Stone Arch. be points on the ellipse from which it is desired to draw the joints.Draw tangents to the ellipse at the points A and B intersecting atC. Draw lines AS and OC. Draw lines from M^, M.„ M.^, etc.,perpendicular to…
Building · Carpentry · Masonry
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