Gooch & Walker's Periodic System of The Elements
From a 1905 textbook by Gooch & Walker: Outlines of Inorganic Chemistry (see the Google Books scanned version pp273) comes an early 'right-step' periodic table. The formulation was reproduced in a 1917 textbook (lower image).
Thanks to Eric Scerri for the tip!
See the website EricScerri.com and Eric's Twitter Feed
Periodic Table, What is it showing? Binary Compounds
© Mark R. Leach 1999-
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