Gooch & Walker's Primary, Secondary, and Tertiary Series of Elements
This three dimensional formulation – clearly developed from the Crookes' vis generatrix model – is given a 1905 textbook by Gooch & Walker: Outlines of Inorganic Chemistry (see the Google Books scanned version pp273).
"The arrangement of the elements in three series of eight groups each may be represented by a model in which large and small wooden balls, on a spiral wire, represent the common and rare elements respectively; those balls falling in the same vertical column representing elements in the same groups":
|Periodic Table, What is it showing?||
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