French Curve -- from Wolfram MathWorld

French curves are plastic (or wooden) templates having an edge composed of several different curves. French curves are used in drafting (or were before computer-aided design) to draw smooth curves of almost any desired curvature in mechanical drawings. Several typical French curves are illustrated above. While an undergraduate at MIT, Feynman (1997, p. 23) used a French curve to illustrate the fallacy of learning without understanding. When he pointed out to his colleagues in a mechanical

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French Curve -- from Wolfram MathWorld

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Free STL file French Curve for Sewing pattern and calculator 🪡・3D printable model to download・Cults