. The Practical brick and tile book. Fig. 59. the arc a e. In the same way draw the arcs l f,cf. Through e and d draw the line eg; throughc f the line / //. TTith d as centre, radius d b,draw the arc b i, and from e, radius e i, the arcij. The points from which the joints radiate areshown by dotted lines. Two different face mouldsare required for this arch. The Semi-Ellipse Arch. Divide the span a b, Fig. 60, into two equalparts, a c, c b, and a c, into six equal parts, 1, 2, GAUGED-WOKK AND AROH-CUTTINO. 3 3, 4, &c. From c towards b measure off two ofthose parts, and with the distance 4 d in
. The Practical brick and tile book. Fig. 59. the arc a e. In the same way draw the arcs l f,cf. Through e and d draw the line eg; throughc f the line / //. TTith d as centre, radius d b,draw the arc b i, and from e, radius e i, the arcij. The points from which the joints radiate areshown by dotted lines. Two different face mouldsare required for this arch. The Semi-Ellipse Arch. Divide the span a b, Fig. 60, into two equalparts, a c, c b, and a c, into six equal parts, 1, 2, GAUGED-WOKK AND AROH-CUTTINO. 3 3, 4, &c. From c towards b measure off two ofthose parts, and with the distance 4 d in the com-pass, and one leg fixed at 4, draw an arc cutting-the centre line in e. Through e cl draw the lineef; with d as centre, radius d b, draw the arcb g, and from e Avith radius e g, the arc g h. Twoways are here shown of putting in the courses—one in which the joints radiate from their centres. or foci d e, the other from c the centre of theopening. In the second method the lengths andbevels of each brick would be different. The firstis an arch, the second a scheme, and is neveradopted except in face work when, in the opinionof some people, it is desirable to have the coursesall one thickness, even at the loss of the second method the mould, lengths, andbevels are taken off in the same way as those ofthe camber. 74 BRICKWORK. The Yexetian Arch. This so-called arch, Fig. 61, is made up of thecamber and semi, and was a few years ago verymuch used in the construction of three-lig-ht
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbr, booksubjectbricks
