Chap. XXXI.
PRINCIPLES OF PROPORTION.
1613
this beautiful example is given, for the purpose of exhibiting the principle upon which it isset out: it will be evident that the nucleus of the design is composed of two equilateraltriangles, and the sides of each continued, constitute the alternate divisions.
Fig. 3021.
The internal hexagon has its parallel sides prolonged, to mark the position of the fourdivisions that have their pointed heads attached to the small circle, which forms the eye ofthe pattern; and the length of these prolonged lines is limited to the extent of the sides ofan equilateral triangle, which is again divided regularly, the triangular spaces betweenbeing filled in with trefoils. The small mullions are in width inches, the next size3 inches, and those which mark out the figure and have a head for their termination are4' inches: another bead and bold projecting label, or rim, circumscribe the whole rose window,the hollow around which is enriched with a curved leaf. On each side of the internalhexagon an equilateral triangle is constructed, around which a circle is struck, unitingelegantly with the next, and forming the six turns which characterise the filling in of