1610

THEORY AND PRACTICE OF ENGINEERING.

Book II.

the more simple of three days or lower divisions, the head is occupied by three circles,each of which contains a trefoil constructed upon the crossing of either three or four equi-lateral triangles.

A very extraordinary design, composed of intersecting circles, is to be seen at the eastend of the chancel of the church at Sutton, at Hone, in Kent ; although much dilapidated,it still preserves^many of its original flowing lines, all struck from the same radius, throughpoints previously determined by crossing the primitive circle by four equilateral triangles.

At half the height of the headof the window a horizontal linemay be supposed to be drawnfrom one side to the other, onwhich are three circles: the twoouter touching, are crossed bythe third, struck from the pointof their junction ; with the sameradius several spherical trianglesare struck from the -points ofintersections, producing thelines, which unite and dividethe window head into severalcompartments, differing in pat-tern and dimension. After thecircles were struck, the lines thatdid not play into each otherwere left out, and those only re-tained which flowed on grace-fully; by these nice consider-ations and just application ofprinciples, the masons were cer-tain of producing a perfect ef-fect, without rigidly adhering toany particular form. Fig. 3014. section at hone, Kent .

Windows of four Days or Divisions. — Among the heads of a more simple characterare those which contain one large circle, subdivided by three equilateral triangles, each

Fig. 3016.

Fig. 3015.

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inclosing a trefoil. Others contain, in addition to the one great equilateral triangle,two smaller, constructed upon the points of its base, and dropping into the space comprisedbetween the heads of the divisions below.