Friday, February 11, 2011

Equiangular Spiral

equi spiral def

Equiangular Spiral The basic formula for the nautilus shell, like the pyramids, is a very specific number to get the effect. In this case, any more or less that 80 degrees makes the spiral too narrow or too wide. 80 degrees is just right (the slope of the walls of the the Great Pyramid at Cheops is 51° 51' - the maximum that the structure can withstand before collapsing). Then there's fractals, sometimes at the same time.


This kind of spiral is also used at the end of a handrail for a fancy newel post.

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