. The Practical brick and tile book. dc for radius,describe an arc cutting the upright line in e. Fromthis point draw a straight line through d to anypoint F, and another through c to h ; then with das centre and d b for radius describe the arc f b, and DRAWING, CUTTING, AND SETTING ARCHES. 4l take c for centre and same radius for the oppositeellipse A H, and, lastly, e for centre and e h forradius, to describe the crown h f. The soffit-ringis drawn from the same points. It is thought bysome that the moulds can be taken by drawinglines as shown from divisions on the outer curves;but it is evid
. The Practical brick and tile book. dc for radius,describe an arc cutting the upright line in e. Fromthis point draw a straight line through d to anypoint F, and another through c to h ; then with das centre and d b for radius describe the arc f b, and DRAWING, CUTTING, AND SETTING ARCHES. 4l take c for centre and same radius for the oppositeellipse A H, and, lastly, e for centre and e h forradius, to describe the crown h f. The soffit-ringis drawn from the same points. It is thought bysome that the moulds can be taken by drawinglines as shown from divisions on the outer curves;but it is evident the bricks in the arch cannot beall of one size and shape if this is done, althoughthere is little doubt the arch is stronger that way,owing to there being a better skewback at h and ffor the crown than there would be if each coursewere cut to one mould; it is unnecessary to saythis is the easiest method. But the appearance isnot so good, for it is an understood thing in thetrade that all courses of an arch should be of The Wheel Arch, or Biiirs-etjc (Fig. 32).—Tnthis arch the outer circle is divided out iu such a 42 BRICKLAYING. manner that each line, a b, c d, shall be in thecentre of the course; or, in other words, thateach of these points shall show a key brick, inthe same way as one key is shown in the semi-circular arch. Where two or more arches are set close to-gether, saddles ought always to be cut, asshown at a and b (Fig. 33), and not a continual
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbr, booksubjectbricks
