. The Practical brick and tile book. 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 understandi
. The Practical brick and tile book. 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-. But the drawing ferenee being in the crownsis quite, different. In drawing this arch, dividethe span into three equal parts, as shown at a c d b,then, with d as centre and d b for radius, describethe arc from b to e equal to d b, and the same onthe opposite side to f ; then, with d for centre andthe distance d c for radius, describe an arc cuttingthe perpendicular line in g ; and from this point,with the distance g f, describe the arc r e : the 40 RRTCKLAYIXG. oiiter curves are tuken from the same moulds for this arch must be traced in thesame way as the camber and ellipse Gothic; thatis, take the thickness of the brick and set it equallyon each side of the centre line at h, as shown;then draw the lines to g ; this will give the sizeof the mould very nearly; then, if they are workedalternately down to the springing-liue, it will beseen where they want easing, should they requireit. The bevels are all taken separately for eachcourse, but the t bevel reversed will no
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbr, booksubjectbricks
