Graphic representation of the periodic table of chemical elements as a spiral with varying sizes of revolutions. This table was originated by American geologist Benjamin Kendall Emerson (1843-1932) in 1911 and classified by chemist Edward G. Mazurs as Type IIB2-1 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). This table appears as Figure 46 on page 121 of Mazurs' 1957 publication.
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Mazurs, Edward G., and Benjamin Kendall Emerson. “Step Table with Spiral Design.” Glass, circa 1911–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/qj72p7737.
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