Graphic representation of the periodic table of chemical elements designed as a left-side electronic configuration series table "stretched" in a vertical direction. This table was originated by David T. Gibson in 1948 and classified by chemist Edward G. Mazurs as Type IIIC4-1 in his seminal work Types of Graphic Representation of the Periodic System of Chemical Elements (1957). A version of this illustration appears as Figure 88 on page 153 of Mazurs' 1957 publication.
Mazurs, Edward G., and David T. Gibson. “Left-Side Electronic Configuration Series Table ‘Stretched’ in Vertical Direction.” Glass, circa 1948–1957. Edward G. Mazurs Collection of Periodic Systems Images, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/h989r378h.