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*Giotto's perfect circle.
http://www.allaboutdrawings.com/images/circles2.jpg
*Legends: the high school teacher
http://hight3ch.com/wp-content/uploads/2008/01/perfect_circle.jpg
http://www.maniacworld.com/perfect-circle.jpg
*Stroke recording apparatus. Two pulleys. Weights. Rotary encoders.
[[File:arm recording apparatus.jpg|400px]]
=Simultaneous Recording and Reproduction=
*Simultaneous Location And Perversion (SLAP)
=Drawing Machines=
*http://www.thisiscolossal.com/tags/drawing-machines/
=DynaCNC Drawing Machine=
