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.
1916 (Original design), Circa 1957 (Date attributed to slide)
Emerson, Benjamin Kendall, and Edward G. Mazurs. “Step Table Consisting of Helix Wound on Two Stepwise Cylinders.” Glass (material), circa 1911–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/mp48sd395.
Mouse click to zoom in; shift-click to zoom out. Drag to pan. Pinch to zoom on touch.
The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at firstname.lastname@example.org.