The power of form applied to geometric tracery : one hundred designs and their foundations resulting from one diagram (1851)
Billings, Robert William, 1813-1874 · Edinburgh ; London Published by the author by William Blackwood and Sons · leaf 17
14 I … In its second form^ by thelines cutting- through thesepoints on the circumference ofthe circle^ and passing- throug-hits centre^ we have the skeletonof our diag-ram^ thus :— The third form is the perfectedfig-ure upon which our desig-nsare produced. It is simply theintroduction into the…
Decoration and ornament · Geometrical drawing
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