Plan and perspective views of a graphic representation of the periodic table of chemical elements as a helix wound on two stepwise cylinders. This table was originated by American geologist Benjamin Kendall Emerson (1843-1932) in 1911 and classified by chemist Edward G. Mazurs as Type IIA2-1 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). A version of this illustration appears as Figure 45 on page 120 of Mazurs' 1957 publication.
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Emerson, Benjamin Kendall, and Edward G. Mazurs. “Step Table Consisting of Helix Wound on Two Stepwise Cylinders.” Glass, circa 1911–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/mp48sd395.
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