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    • circa 1957 (Date attributed to slide)
    • 1925 (Original design)

    Graphic representation of the periodic table of chemical elements as a symmetrical series table constructed in the form of a quadrangle. This table was originated by Estonian-born German chemist Andreas von Antropoff…

    • 1886 (Original design)
    • circa 1957 (Date attributed to slide)

    Graphic representation of the periodic table of chemical elements as a symmetrical series table with centered steps. This table was originated by English chemist Thomas Carnelley (1854-1890) in 1886 and classified by…

    • 1942 (Original design)
    • circa 1957 (Date attributed to slide)

    Graphic representation of the periodic table of chemical elements as a spiral and plane lemniscate. This table was originated by Friedrich Kipp in 1942 and classified by chemist Edward G. Mazurs as Type IIB2-2 in his…

    • circa 1957 (Date attributed to slide)
    • 1914 (Original design)

    Perspective and plan views of a graphic representation of the periodic table of chemical elements as a helix and space lemniscate, with the helix drawn for the short periods and the space lemniscate drawn for the medium…

    • circa 1930

    Two close-up views of a demonstration of the cold-drawing technique used to produce the 3-16 polyester super-silk fiber, the forerunner of nylon. This technique was discovered by DuPont chemist Julian Hill (1904-1996)…