T i p s & T r i c k s t o o t h i c G e o m e t r y
Tips & Tricks to Gothic: Trefoil  Ogee Arch  Equilateral Arch  Rose Window

NOTE: This blueprint may be simple compared to period designs by Gothic masters. However, the geometry behind it can be a little daunting if you aren't familiar with the developmental steps described so far in this book.
Basic construction begins with a hexagon. Within the hexagon a complete circle is inscribed and, suddenly, you're halfway home...
Set out baseline AB. Bisect it to find the vertical center line. Construct the rise BC equal to AB. Spread out your compass to the length of AB and, with the needle on point B, construct arc AC. Where it intersects with the vertical is the center point, D. From D, spread out compass to A and construct a complete circle. Now with compass spread out to the length of AB, step around the circle to find the six sides of the hexagon.

Now bisect the walls of the hexagon into 12 parts as shown. 

To 'slice up the
pie' draw the diagonals as shown. To begin

Use the smaller
circle as a center line to inscribe 

Remove the unnecessary
scribe lines to reveal the first 
Next, the process
is repeated on a larger scale  with 

From the center points, inscribe larger circles as shown. 
Remove the scribe lines to reveal the larger 'petals.' 

The completed rose window. 
Tips & Tricks to Gothic: Trefoil  Ogee Arch  Equilateral Arch  Rose Window
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