. The Practical brick and tile book. themoulds of the arch shown in Fig. 28, applies toany Gothic, whether greater or less than the regularequilateral arch. The Ellipse Gothic (Fig. 29) is rather more diffi-cult in the working than the generality of Gothicarches, owing to the different striking points. Todraw this arch, let the distance a b be set offequally on each side of the perpendicular line ;then divide it into four equal parts by markingthe points c d, and with d as centre, and thedistance D B as radius, describe the arc from b toE, mark the point b e equal with b d, draw thechord F E,
. The Practical brick and tile book. themoulds of the arch shown in Fig. 28, applies toany Gothic, whether greater or less than the regularequilateral arch. The Ellipse Gothic (Fig. 29) is rather more diffi-cult in the working than the generality of Gothicarches, owing to the different striking points. Todraw this arch, let the distance a b be set offequally on each side of the perpendicular line ;then divide it into four equal parts by markingthe points c d, and with d as centre, and thedistance D B as radius, describe the arc from b toE, mark the point b e equal with b d, draw thechord F E, and bisect it at g, from which pointdraw a line with the setsquare to any point o, andupon this line the centre is taken to draw theupper portion of that side of the arch as shown; 38 BRICKLAYING. the soffit curves are obtained in the same the lines a f e b are drawn, they can bemade to answer either for soffit or exirados, bystriking the other parts greater or less than thosenamed; in this figure they represent the outer. Fig 28. ring; but the centres will do for either. Themoulds for this arch are taken in the same way asthose in the camber. Fig. 25; that is, it must betraced over with the moulds, so that each courseshall be exactly of one size, and the bevels mustbe taken separately. It is of the greatest importance that the work-man should practise drawing this arch until he isthoroughly acquainted with every part; for very DRAWING, CUTTING, AND SETTING ARCHES. 39 often he may require quite a different kind ofellipse Gothic to the one here described, and byhis understanding the principles of this one hewill be better able to reduce or elevate them tosuit his requirements. Perfect accuracy in allgood brickwork cannot be too much impressedupon the mind of the bricklayer, and more par-ticularly in drawing and cutting arches. Fig. 30 represents a semi-ellipsis arch, and is agreat deal like the ellipse Gothic, the only dif-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbr, booksubjectbricks
