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Elliptical Drawing Jig
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This is the jig that I used in my most recent YouTube video where I discuss Heidelberg's Echo and the principal that drives ellipses and parabolas.
Tie some string to each of the posts and thread a pen or pencil through.
https://www.youtube.com/watch?v=Xwmy4Tlc-5k
Tie some string to each of the posts and thread a pen or pencil through.
https://www.youtube.com/watch?v=Xwmy4Tlc-5k
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