A treatise on architecture and building construction . n Fig. 45. Let A be the circular wall, and a b anda b the splayed jambs of the opening. Draw a a equal tothe width of the opening on the concave side of the wall,and b b equal to the width of the opening on the convexside of the wall. Continue the sides of the jambs a b anda b till they intersect at e. Draw efoX right angles to aa\with r as a center, describe the semicircle afa. Divide thequarter circle <7/into three or more equal parts, as at / and /;from these points draw Jen and Jip^ perpendicular to aa\also, draw ep and c n. With ^
A treatise on architecture and building construction . n Fig. 45. Let A be the circular wall, and a b anda b the splayed jambs of the opening. Draw a a equal tothe width of the opening on the concave side of the wall,and b b equal to the width of the opening on the convexside of the wall. Continue the sides of the jambs a b anda b till they intersect at e. Draw efoX right angles to aa\with r as a center, describe the semicircle afa. Divide thequarter circle <7/into three or more equal parts, as at / and /;from these points draw Jen and Jip^ perpendicular to aa\also, draw ep and c n. With ^ as a center and r « as radius,draw the arc a a of indefinite length, and lay off from a onit the distances an, np\ etc., equal to aJc, kk, etc., the § 10 JOINERY. 65 number of divisions beini;- twice those laid oil on af\draw lines from c to «, p, etc. To find any developedlength, // (//, for example, draw pp^ perpendicular to f/,and equal in length to p k\ also draw cp^. Draw uu^ andqq^ parallel topp^; then/^ q^ and q^ 21^ iire the true lengths e. Fig. 45. oi pq and qu, and, laid off as shown on the proper lines,corresponding to ep, as cp and r/, will give points on thedevelopment of the soffit. All other points being found inthe same manner, the complete development is <^^/<^rt:r( outer full line and the dotted line represent the bevelededges of the soffit. 80. The plan of a window or door opening in a straightwall with splayed jambs, and a semicircidar soffit on one sideof the wall, and a scmielliptieal one on the other side, soarranged as to preserve the crown of the soffit level, areshown in Fig. 40. Let A be the wall, and rt:^, 00 the open-ing and splay of the jambs; continue the splayed-face lineof the jambs a0 and ao to/; through the center of the 66 JOINERY. §10 opening-, draw the center line fJ; from / as center, and witha radius ko\ draw the semicircle ou o, which will be theinterior elevation of the window head, and divide it into anynumber of equal p
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
