o more atpresent than to repeat our desire of acareful study of the following: Problem XII. To draw the archesof a groin, so that they shall intersect ormitre truly together over a straight line,from a given arch of any form. Lay off the width of one of the otherarcher. S-..-.M ■ ,-■_■_ ■ ..j… … This is the arch of one side, which ishere a semi-circle. Draw the chord line A B, which di-vide into any number of equal parts ;from the centre, draw lines throughthose parts, touching the arch; drawA C, perpendicular to the base line,and from the crown of the arch at B,draw lines through the…
Architecture
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