. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. 3. To make the drawings for an obliqne arch bg an abridged method. The followingmethod is said to be abridged, because, by one very short operation the moulds of thesofites and joints are found within the plan of the arch ABDC (fig- 650.). Divide ABin E into two equal parts, and draw EF parallel to AG. From the point A draw AGperpendicular to AC; i)rolong DB to G ; divide AC into two equal parts in the point H, as a centre, describe the arc A
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. 3. To make the drawings for an obliqne arch bg an abridged method. The followingmethod is said to be abridged, because, by one very short operation the moulds of thesofites and joints are found within the plan of the arch ABDC (fig- 650.). Divide ABin E into two equal parts, and draw EF parallel to AG. From the point A draw AGperpendicular to AC; i)rolong DB to G ; divide AC into two equal parts in the point H, as a centre, describe the arc AFG, which divide into voussoirs, and draw thejoints from the centre H. Draw lines from each sofite jjarallel to EF, and below the lineCD; the moulds for the sofitcs are comprised between the parallels of the key, and those ofthe joints are traced on the sides of the plan, as follows : — 1974. To find the moulds of the sofites. Through the point Q draw Q\ parallel toGil. iofindon HS the |)oint N, through the point K draw KE also jiairallel to (ill. Tofind on Q T the point .M, and on US tiie point L, draw the front line of the second sofite. 600 TllEOUY OF AllCHITKCTURE. Bu.« 51
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