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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 126
The radius of 3, 3, is the diameter of the outer circle. of the same radius. Nos. 4, 5, are curvea … XCVII.Decoration and ornament · Geometrical drawing
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
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