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needed to be graded, meaning systematically increased or decreased. A German mathematician Dr. Henry Wampen wrote two influential works, The Mathematical Art of Cutting Garments According to the Different Formation of Men's Bodies (1834) and Mathematical Instructions in Constructing Models for Draping the Human Figure (1863). Wampen introduced the principle of gradation via these works. The Mathematical Art was translated into English by J. Happle-Hutcheson as Dr. Wampen's World Renowned System of Anthropometry as Simplified and Americanized in

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