. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature. imens of various sorts of the tracery which adornthe windows of the mediieval periods, and are in fact theirgreatest glory, are shown in Elates XVIIL, XIX., andXX. of voL IL The designs for tracery are ahnost in-finite, and the various methods of setting them out wouldfill a volume. But although they display such ingenuityand fancy that one would think the design to be quitearbitrary, it will be found that they are all, or very nearlyall, set out on the principle of geometrical example w
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature. imens of various sorts of the tracery which adornthe windows of the mediieval periods, and are in fact theirgreatest glory, are shown in Elates XVIIL, XIX., andXX. of voL IL The designs for tracery are ahnost in-finite, and the various methods of setting them out wouldfill a volume. But although they display such ingenuityand fancy that one would think the design to be quitearbitrary, it will be found that they are all, or very nearlyall, set out on the principle of geometrical example will show the principles on which the mediaevalarchitects proceeded to describe the tracery, and also themethod of finding the joints of the various pieces of stone. Let ab (fig. 27) be the opining of the arch ; as there are to betwo mullions, divide the same into three equal parts, aa ac,cd,db;then determine the points from ? which to strike the arch. Inthis instance, for the sake of simplicity, wo make it equilateral(as in fig. 24); a and b then are the centres for striking the main. a. cod Fia. 27.—Construction of Window Tracery. arch a eg, bfg, and the height oj is that of an equilateraltriangle. Produce the springing line, and the same opening of thecompasses through c and d will give the principal inner branchesof the tracery c e, df. From the centre o, with an opening extend-ing to the middle of the lights ac,di, strike a semicirolo ; raiseperpendiculars from d and e to 1 and 2 ; draw a line through 1 and2 ; on this and the springing line will be found the centres of thelower o^ees ; bisect the part of j o cut off by 1 2 in A, which isin fact the same thing as dividing the whole height og into three ;divide h g into three parts, at 3 and 4 ; through 3 draw a horizon-tal line, and set off from 3 distances one-third of the width o d, ordraw the perpendicular hues as shown, which is better i then 5 and 6win be the centres of the upper quatre-foil. From the line 1 2, onthe
Size: 1623px × 1539px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
